[Asterisk-Users] SIP phone behind NAT

[Olaf Menzel]

Hi all,
--------

I have a Asterisk at a public Network (official IP address). In the local 
network I have isntalled a Snom 200 IP phone and in my home network (behind 
NAT) a Snom 100 device.  I can dial the Snom200 device from my home location 
without any problems but the Snom200 can not dial me. It always gets a "we do 
not rely". I tried to forward the SIP Port (5060) UDP via UPnP to the 
internal Snom100 IPadress and a port range forwarding  of 16384 -  32768 
(UDP) for the RTP traffic. Additionally I tried to change host = dynamic to  
host = myserver.dyndns.org to ensure the SIP traffic is going to my Linksys 
ADSL router and be forwarded to the internal SIP 100 phone. But all my effort 
did not have success. Any suggestions ??

regards

Olaf




---- extensions.conf -----

[sip]
; will be replaced by a macro 

exten => 2123,1,Dial(SIP/snom200,30,tr)
exten => 2123,2,Playback(new/nbdy-avail-to-take-call)
exten => 2123,3,Voicemail(u2123)
exten => 2123,4,Hangup
exten => 2123,102,Voicemail(b2123)
exten => 2123,103,Hangup

exten => 2124,1,Dial(SIP/snom100,30,tr)
exten => 2124,2,Playback(new/carried-away-by-monkeys)
exten => 2124,3,Voicemail(u2124)
exten => 2124,4,Hangup
exten => 2124,102,Playback(new/lots-o-monkeys)
exten => 2124,103,Voicemail(b2124)
exten => 2124,104,Hangup



------------ sip.conf ------
[snom200]
type=friend
secret=snom200
host=ip-adress-of-snom200
dtmfmode=rfc2833
mailbox=2123
context=sip
callerid="snom200" <2123>

[snom100]
type=friend
secret=snom100
host=dynamic
nat=1
dtmfmode=rfc2833
mailbox=2124
context=sip
callerid="snom100" <2124>