[Asterisk-Users] SIP Proxy Problem (NAT Environment)

[Markus Miertschink]

I have the problem calling from a NAT firewalled SIP Phone to sipgate.de.
Somehow it is working. The connection works. Everything seems to be fine. I
could talk to the external phone. But: the external voice gets not
transmitted to my internal (calling) phone.

 

Calling inbound from SipGate to the same phone works perfectly. Both
channels are perfectly "proxied".

 

The * is used as a proxy and registered the sipgate account.

 

This way works:

 

SIPGATE ----->NAT(IP0)------>Asterisk(IP1)------->IP-Phone(IP2)

 

This not (partially):

 

SIPGATE<----NAT(IP0)<-----Asterisk(IP1)<-----IP-Phone(IP2)

 

All ports are mapped to the address of IP1. If I look into the tcpdump log
it seems that all ports used there are matching my NAT settings. Asterisk is
happy. No problems.

I only run into immediate abortion of the call if Asterisk is configured
using outbound_address with the ip of IP0.

 

I have no clue what to do anymore.

 

Regards,

Markus

 

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