[asterisk-users] problems with natted phones
Marek Greško
mgresko8 at gmail.com
Sat Sep 4 17:54:10 CDT 2021
Hello,
I first tried to communicate to internet provider but without any
result. They told me I should find problem on my side. It does not
seem the provider is blocking SIP, since it is working for some time
and then stops. But I suspect the problem could be the NAT address
change. The provider offers only some IPv6 tunnel to his network and
the NAT is done probably on other property, I am not sure. But the
local provider's router does not possess any ipv4 address on the
external interface, only ipv6. I noticed the change now, when
anonymizing the tcpdumps. But the working scenario is after reboot, so
the ip address change is expected, but I cannot guarantee it does not
change in time. Maybe my previous expectation it is caused by asterisk
reboot was misleading. Could this be the cause? If yes, are there any
means how to overcome it on the asterisk side? I attached the
tcpdumps. Do you see something inconsistent in it?
By algorithms I meant when the router actively translates the sip
payload to change the lan addresses to the natted one.
Thanks
Marek
2021-09-05 0:40 GMT+02:00, Antony Stone <Antony.Stone at asterisk.open.source.it>:
> On Thursday 08 July 2021 at 20:57:30, Marek Greško wrote:
>
>> Hello,
>>
>> I have an asterisk setup using pjsip. Everything used to work
>> correctly until one remote site changed internet provider and thier
>> router does not support sip protocol algorithms.
>
> I'm slightly bothered by the word "algorithms" in that comment, but I do
> wonder whether it simply means that this is a connectivity provider
> (possibly
> a mobile phone network?) which actively blocks SIP.
>
> Some of them (in my experience) do this by blocking UDP port 5060, but
> others
> are more subtle about it, and (for example) block the authentication
> responses
> to a Register request, thereby meaning that UDP port 5060 is in general
> accessible, but any attempt to Register to it using SIP will fail.
>
> Have you asked the new Internet connectivity provider whether they support
> or
> block SIP across their network?
>
>
> Antony
>
> --
> "Remember: the S in IoT stands for Security."
>
> - Jan-Piet Mens
>
> Please reply to the list;
> please *don't* CC
> me.
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
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>
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-------------- next part --------------
21:39:47.710512 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP
21:39:49.950775 IP 198.51.100.1.5060 > 192.0.2.1.32260: SIP: INVITE sip:999 at 192.0.2.1:32260 SIP/2.0
INVITE sip:999 at 192.0.2.1:32260 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPjf0991750-2e98-4f19-9749-c4eee08a4e37
From: <sip:111 at 198.51.100.1>;tag=e842dd73-cda0-45f5-81a7-a8fcc1472ac9
To: <sip:999 at 192.0.2.1>
Contact: <sip:asterisk at 198.51.100.1:5060>
Call-ID: 603c61b6-5679-452a-aafa-0436f8d8b672
CSeq: 19604 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub, histinfo
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Type: application/sdp
Content-Length: 376
v=0
o=- 121003081 121003081 IN IP4 198.51.100.1
s=Asterisk
c=IN IP4 198.51.100.1
t=0 0
m=audio 13786 RTP/AVP 8 18 97 3 4 101
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 iLBC/8000
a=fmtp:97 mode=20
a=rtpmap:3 GSM/8000
a=rtpmap:4 G723/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv
21:39:50.022921 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP: SIP/2.0 100 Trying
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjf0991750-2e98-4f19-9749-c4eee08a4e37
From: <sip:111 at 198.51.100.1>;tag=e842dd73-cda0-45f5-81a7-a8fcc1472ac9
To: <sip:999 at 192.0.2.1>;tag=1427222172
Call-ID: 603c61b6-5679-452a-aafa-0436f8d8b672
CSeq: 19604 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
User-Agent: A540 IP/42.247.00.000.000
Content-Length: 0
21:39:50.559818 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP
21:39:50.563295 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP
21:39:50.568182 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP: SIP/2.0 180 Ringing
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjf0991750-2e98-4f19-9749-c4eee08a4e37
From: <sip:111 at 198.51.100.1>;tag=e842dd73-cda0-45f5-81a7-a8fcc1472ac9
To: <sip:999 at 192.0.2.1>;tag=1427222172
Call-ID: 603c61b6-5679-452a-aafa-0436f8d8b672
CSeq: 19604 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
Allow-Events: message-summary, refer, ua-profile, talk, check-sync
User-Agent: A540 IP/42.247.00.000.000
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Length: 0
21:39:52.496169 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP
21:39:52.499501 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP
21:39:52.504302 IP 192.0.2.1.32260 > 198.51.100.1.5060: SIP: SIP/2.0 200 OK
SIP/2.0 200 OK
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjf0991750-2e98-4f19-9749-c4eee08a4e37
From: <sip:111 at 198.51.100.1>;tag=e842dd73-cda0-45f5-81a7-a8fcc1472ac9
To: <sip:999 at 192.0.2.1>;tag=1427222172
Call-ID: 603c61b6-5679-452a-aafa-0436f8d8b672
CSeq: 19604 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
Supported: replaces
Allow-Events: message-summary, refer, ua-profile, talk, check-sync
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Type: application/sdp
Content-Length: 212
v=0
o=999 5016 14 IN IP4 192.168.100.235
s=Mapping
c=IN IP4 192.168.100.235
t=0 0
m=audio 5016 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=ptime:20
21:39:52.505359 IP 198.51.100.1.5060 > 192.0.2.1.32260: SIP: ACK sip:999 at 192.0.2.1:32260 SIP/2.0
ACK sip:999 at 192.0.2.1:32260 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPja6adc630-330e-4649-9034-960a278aa12a
From: <sip:111 at 198.51.100.1>;tag=e842dd73-cda0-45f5-81a7-a8fcc1472ac9
To: <sip:999 at 192.0.2.1>;tag=1427222172
Call-ID: 603c61b6-5679-452a-aafa-0436f8d8b672
CSeq: 19604 ACK
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Length: 0
21:39:52.539610 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.559490 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.579581 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.599528 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.612633 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.619622 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.633573 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.639693 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.651777 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.659556 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.671678 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.679609 IP 198.51.100.1.13786 > 192.168.100.235.5016: UDP, length 172
21:39:52.692627 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.699543 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
21:39:52.713069 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.719550 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
21:39:52.731842 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.739666 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
21:39:52.752434 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.759590 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
21:39:52.772686 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.779491 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
21:39:52.792644 IP 192.0.2.1.32327 > 198.51.100.1.13786: UDP, length 172
21:39:52.799528 IP 198.51.100.1.13786 > 192.0.2.1.32327: UDP, length 172
-------------- next part --------------
21:29:24.345269 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: INVITE sip:999 at 192.0.2.2:25298 SIP/2.0
INVITE sip:999 at 192.0.2.2:25298 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPjbdb7de30-4d69-4c60-ae04-405caf5da075
From: <sip:111 at 198.51.100.1>;tag=80639a91-53b2-4357-8137-799dbc0c956d
To: <sip:999 at 192.0.2.2>
Contact: <sip:asterisk at 198.51.100.1:5060>
Call-ID: 3a7d5923-3863-42f9-9164-c3e41a033c81
CSeq: 27260 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub, histinfo
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Type: application/sdp
Content-Length: 376
v=0
o=- 579906816 579906816 IN IP4 198.51.100.1
s=Asterisk
c=IN IP4 198.51.100.1
t=0 0
m=audio 18892 RTP/AVP 8 18 97 3 4 101
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 iLBC/8000
a=fmtp:97 mode=20
a=rtpmap:3 GSM/8000
a=rtpmap:4 G723/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv
21:29:24.426561 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: SIP/2.0 100 Trying
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjbdb7de30-4d69-4c60-ae04-405caf5da075
From: <sip:111 at 198.51.100.1>;tag=80639a91-53b2-4357-8137-799dbc0c956d
To: <sip:999 at 192.0.2.2>;tag=3464629473
Call-ID: 3a7d5923-3863-42f9-9164-c3e41a033c81
CSeq: 27260 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
User-Agent: A540 IP/42.247.00.000.000
Content-Length: 0
21:29:25.458666 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP
21:29:25.467246 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP
21:29:25.467307 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: SIP/2.0 180 Ringing
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjbdb7de30-4d69-4c60-ae04-405caf5da075
From: <sip:111 at 198.51.100.1>;tag=80639a91-53b2-4357-8137-799dbc0c956d
To: <sip:999 at 192.0.2.2>;tag=3464629473
Call-ID: 3a7d5923-3863-42f9-9164-c3e41a033c81
CSeq: 27260 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
Allow-Events: message-summary, refer, ua-profile, talk, check-sync
User-Agent: A540 IP/42.247.00.000.000
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Length: 0
21:29:45.477762 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP
21:29:47.792916 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: OPTIONS sip:999 at 192.0.2.2:25298 SIP/2.0
OPTIONS sip:999 at 192.0.2.2:25298 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPj2beb0270-0f5b-43a7-b600-11f2eeba2bda
From: <sip:999 at 198.51.100.1>;tag=df519730-4d27-4b3f-80b2-e566be692d19
To: <sip:999 at 192.0.2.2>
Contact: <sip:999 at 198.51.100.1:5060>
Call-ID: 06666a3a-0d1c-4575-8a6f-e4440f5776a8
CSeq: 58522 OPTIONS
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Length: 0
21:29:47.836190 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: SIP/2.0 486 Busy Here
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPj2beb0270-0f5b-43a7-b600-11f2eeba2bda
From: <sip:999 at 198.51.100.1>;tag=df519730-4d27-4b3f-80b2-e566be692d19
To: <sip:999 at 192.0.2.2>
Call-ID: 06666a3a-0d1c-4575-8a6f-e4440f5776a8
CSeq: 58522 OPTIONS
User-Agent: A540 IP/42.247.00.000.000
Content-Length: 0
21:29:51.851158 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: SIP/2.0 200 OK
SIP/2.0 200 OK
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPjbdb7de30-4d69-4c60-ae04-405caf5da075
From: <sip:111 at 198.51.100.1>;tag=80639a91-53b2-4357-8137-799dbc0c956d
To: <sip:999 at 192.0.2.2>;tag=3464629473
Call-ID: 3a7d5923-3863-42f9-9164-c3e41a033c81
CSeq: 27260 INVITE
Contact: <sip:999 at 192.168.100.235:5060>
Supported: replaces
Allow-Events: message-summary, refer, ua-profile, talk, check-sync
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Type: application/sdp
Content-Length: 212
v=0
o=999 5010 11 IN IP4 192.168.100.235
s=Mapping
c=IN IP4 192.168.100.235
t=0 0
m=audio 5010 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=ptime:20
21:29:51.852073 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: ACK sip:999 at 192.0.2.2:25298 SIP/2.0
ACK sip:999 at 192.0.2.2:25298 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPj67746a27-b3cd-4ff9-96df-ed76925b19f7
From: <sip:111 at 198.51.100.1>;tag=80639a91-53b2-4357-8137-799dbc0c956d
To: <sip:999 at 192.0.2.2>;tag=3464629473
Call-ID: 3a7d5923-3863-42f9-9164-c3e41a033c81
CSeq: 27260 ACK
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Length: 0
21:29:51.902537 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:51.921804 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:51.946652 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:51.959078 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:51.961670 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:51.977839 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:51.981748 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:51.998112 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.002283 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.018310 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.018388 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: REGISTER sip:example.com SIP/2.0
REGISTER sip:example.com SIP/2.0
Via: SIP/2.0/UDP 192.168.100.235:5060;branch=z9hG4bK60e35c64243d49794c7fe7633ddfe6d9;rport
From: "999" <sip:999 at example.com>;tag=3323527090
To: "999" <sip:999 at example.com>
Call-ID: 4293165323 at 192_168_100_235
CSeq: 1039 REGISTER
Contact: <sip:999 at 192.168.100.235:5060>
Max-Forwards: 70
User-Agent: A540 IP/42.247.00.000.000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Length: 0
21:29:52.019229 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: SIP/2.0 401 Unauthorized
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.100.235:5060;rport=25298;received=192.0.2.2;branch=z9hG4bK60e35c64243d49794c7fe7633ddfe6d9
Call-ID: 4293165323 at 192_168_100_235
From: "999" <sip:999 at example.com>;tag=3323527090
To: "999" <sip:999 at example.com>;tag=z9hG4bK60e35c64243d49794c7fe7633ddfe6d9
CSeq: 1039 REGISTER
WWW-Authenticate: Digest realm="asterisk",nonce="...",opaque="...",algorithm=md5,qop="auth"
Server: Asterisk PBX 18.2.0
Content-Length: 0
21:29:52.021720 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.038545 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.041927 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.058806 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.061721 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.077728 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: REGISTER sip:example.com SIP/2.0
REGISTER sip:example.com SIP/2.0
Via: SIP/2.0/UDP 192.168.100.235:5060;branch=z9hG4bKe79c079d97e731a855ba2703475fb64;rport
From: "999" <sip:999 at example.com>;tag=3323527090
To: "999" <sip:999 at example.com>
Call-ID: 4293165323 at 192_168_100_235
CSeq: 1040 REGISTER
Contact: <sip:999 at 192.168.100.235:5060>
Authorization: Digest username="999", realm="asterisk", qop=auth, algorithm=md5, uri="sip:example.com", nonce="...", nc=..., cnonce="...", opaque="...", response="..."
Max-Forwards: 70
User-Agent: A540 IP/42.247.00.000.000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, SUBSCRIBE, NOTIFY, REFER, UPDATE
Content-Length: 0
21:29:52.078963 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: SIP/2.0 200 OK
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.100.235:5060;rport=25298;received=192.0.2.2;branch=z9hG4bKe79c079d97e731a855ba2703475fb64
Call-ID: 4293165323 at 192_168_100_235
From: "999" <sip:999 at example.com>;tag=3323527090
To: "999" <sip:999 at example.com>;tag=z9hG4bKe79c079d97e731a855ba2703475fb64
CSeq: 1040 REGISTER
Date: Wed, 25 Aug 2021 19:29:52 GMT
Contact: <sip:999 at 192.168.100.235:5060>;expires=179
Expires: 180
Server: Asterisk PBX 18.2.0
Content-Length: 0
21:29:52.079361 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.079534 IP 198.51.100.1.5060 > 192.0.2.2.25298: SIP: NOTIFY sip:999 at 192.0.2.2:25298 SIP/2.0
NOTIFY sip:999 at 192.0.2.2:25298 SIP/2.0
Via: SIP/2.0/UDP 198.51.100.1:5060;rport;branch=z9hG4bKPj5ef2e7a5-a69c-424a-aa5b-5bb6fe707c1d
From: <sip:999 at 198.51.100.1>;tag=30a69684-6704-44d1-829a-0605b8330a95
To: <sip:999 at 192.0.2.2>
Contact: <sip:999 at 198.51.100.1:5060>
Call-ID: 5fe35269-6967-40c6-8dab-28a9ce8b6f9a
CSeq: 24036 NOTIFY
Subscription-State: terminated
Event: message-summary
Allow-Events: presence, dialog, message-summary, refer
Max-Forwards: 70
User-Agent: Asterisk PBX 18.2.0
Content-Type: application/simple-message-summary
Content-Length: 48
Messages-Waiting: no
Voice-Message: 0/0 (0/0)
21:29:52.081699 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.099236 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.102360 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.118666 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.121800 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.138419 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.141817 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.146476 IP 192.0.2.2.25298 > 198.51.100.1.5060: SIP: SIP/2.0 200 OK
SIP/2.0 200 OK
Via: SIP/2.0/UDP 198.51.100.1:5060;rport=5060;branch=z9hG4bKPj5ef2e7a5-a69c-424a-aa5b-5bb6fe707c1d
From: <sip:999 at 198.51.100.1>;tag=30a69684-6704-44d1-829a-0605b8330a95
To: <sip:999 at 192.0.2.2>;tag=21a78795-7615-55e0-938a-1714c9221a84
Call-ID: 5fe35269-6967-40c6-8dab-28a9ce8b6f9a
CSeq: 24036 NOTIFY
User-Agent: A540 IP/42.247.00.000.000
Content-Length: 0
21:29:52.158636 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.161696 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.178434 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.181780 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.198078 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.202375 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.218206 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.221728 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.238109 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.241778 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.257884 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.261692 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.279019 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.281761 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.301923 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.302326 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.317860 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.321715 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.341484 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.341749 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.359997 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.361690 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.378425 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.381804 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.400860 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.402425 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.419699 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.421701 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.438972 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.441744 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.458593 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.461711 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.478176 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.481711 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.498212 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.502479 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.517665 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.521650 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.538500 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.541733 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.559037 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.561836 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.580307 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.581813 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.598911 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.602448 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.621048 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.621634 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.641809 IP 198.51.100.1.18892 > 192.168.100.235.5010: UDP, length 172
21:29:52.642887 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
21:29:52.658179 IP 192.0.2.2.25420 > 198.51.100.1.18892: UDP, length 172
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