Remote Phone Audio Only Working on Inbound Calls 1

[gknight1]

IPO running R8.1(95). The phone registers and can receive inbound and outbound calls, however any outbound call whether to another ext or external gets no audio. The call connects, but neither party can hear each other. Inbound calls from other exts or external work fine, audio comes across perfect. I know it seems like its a port issue for the RTP ports, but I temporarily had the IT vendor open up everything on the firewall just to test and it didn't make a difference.

Any ideas on what else I could try?

 

[gknight1]

Also, its a 9608G and I have tried toggling on and off Allow Direct Media, it didnt seem to make a difference either enable or disabled.

 

[gknight1]

bump

 

[wrenchmonkey]

It doesn't look like anyone wants to touch on this one. Talk path issues with IP phone will almost always have to do with network routing (I could argue always). The fact that inbound calls work but outbound calls don't sounds like your firewall is seeing the change in packet IP addresses as being spoofed and blocking them. I've seen this more with Check Point that others. The only way you're going to get to the root of the problem is with a wireshark trace. The issue is probably reported somewhere within the logs of the network, but that's a needle in a haystack. Sorry I can't give you much to run with, but hopefully it will point you in the right direction.

 

[holdmusic34]

Make sure there's a correct ip route in the ip office to the gateway.

Depending on the URI configuration the ICR can be completely ignored.

If your URI is configured to use internal data then the IP Office will look into the user's SIP tab and if you have *'s it will look into ICR.

A madman with a taste for speed.

 

[gknight1]

there is a default route pointing to the correct gateway, there is no SIP involved.

 

[qtelcom]

check that any H.323 ALGs are disabled on the router/firewall, I take it this works fine on the internal LAN network but you are having one way going through the router/firewall? Could be the remote end's router/firewall issue also.