[asterisk-users] Asterisk not receiving call from VPN address

[Duncan Turnbull]

On 21/01/2014, at 6:40 pm, David Cunningham <dcunningham at voisonics.com> wrote:

> Hi Paul,
> 
> Using ngrep/tcpdump shows the packet clearly going from the Kamailio server and arriving at the Asterisk server. This is why it's a mystery that Asterisk doesn't see the call coming in. We tried removing the firewall (so iptables -L shows no rules at all) but that didn't help unfortunately.
> 
Can you show a packet dump of the SIP invites arriving at the asterisk PBX , mostly just confirming the ip address that the server is receiving packets on 

root at zespri:~# tcpdump udp port 5060 -A -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:52:23.063862 IP 192.168.51.7.5060 > 27.111.14.65.5060: SIP, length: 534
E`.2.L.. at .....3..o.A......u.OPTIONS sip:sip.2talk.co.nz SIP/2.0
Via: SIP/2.0/UDP 192.168.51.7:5060;branch=z9hG4bK45a08b58;rport
Max-Forwards: 70
From: "Unknown" <sip:049343953 at 192.168.51.7>;tag=as32fe455a
To: <sip:sip.2talk.co.nz>
Contact: <sip:0412345678 at 192.168.51.7:5060>
Call-ID: 10c0242d16529fff78572ef91ef47237 at 192.168.51.7:5060
CSeq: 102 OPTIONS
User-Agent: FPBX-2.10.1(10.6.1)
Date: Tue, 21 Jan 2014 05:52:23 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Length: 0


18:52:23.084330 IP 27.111.14.65.5060 > 192.168.51.7.5060: SIP, length: 472
E.......9....o.A..3.......r.SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 192.168.51.7:5060;branch=z9hG4bK45a08b58;received=192.168.51.7;rport=5060
From: "Unknown" <sip:049343953 at 192.168.51.7:5060>;tag=as32fe455a
To: <sip:sip.2talk.co.nz>;tag=as7b633145
Call-ID: 10c0242d16529fff78572ef91ef47237 at 192.168.51.7:5060
CSeq: 102 OPTIONS
Server: 2talk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces
Accept: application/sdp
Content-Length: 0

Also the udp ports asterisk is listening on 

e.g 
netstat -udpl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 0.0.0.0:4520            0.0.0.0:*                           1413/asterisk   
udp        0      0 0.0.0.0:4569            0.0.0.0:*                           1413/asterisk   
udp        0      0 0.0.0.0:5000            0.0.0.0:*                           1413/asterisk   
udp        0      0 0.0.0.0:5060            0.0.0.0:*                           1413/asterisk   



> 
> 
> On 21 January 2014 15:29, Paul Belanger <paul.belanger at polybeacon.com> wrote:
> On Mon, Jan 20, 2014 at 4:24 PM, David Cunningham
> <dcunningham at voisonics.com> wrote:
> > Hi Paul,
> >
> > The ngrep on the Asterisk server does show it being received. Have you any
> > idea what would prevent it getting from the network stack to Asterisk on
> > that machine?
> >
> Well, you need to use tcpdump on each hop across your network. If are
> Asterisk is not getting anything, either it is not receiving anything
> (check transmit side) or the firewall is dropping it.
> 
> --
> Paul Belanger | PolyBeacon, Inc.
> Jabber: paul.belanger at polybeacon.com | IRC: pabelanger (Freenode)
> Github: https://github.com/pabelanger | Twitter: https://twitter.com/pabelanger
> 
> --
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> 
> 
> -- 
> David Cunningham, Voisonics
> http://voisonics.com/
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> -- 
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
> New to Asterisk? Join us for a live introductory webinar every Thurs:
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