One Way Speech Issue

[royce.clark]

I have an issue with one way speech using the MyIC sip companion mobile client.

I have just upgraded an existing OXO customer to RCE release 9.1 and installed 7 MyIC mobile client licences with 7 SIP companion licences.

The installation of the software is fine and the mobile side of the MyIC client works fine. The client will register as SIP companion and I am able to make and receive calls ok on the internal network. However I am always getting one way speech when talking to an existing desk phone or making an outside call. I can get voice to the PABX but I am not receiving anything back to the MyIC Client.

Funny enough it works fine between 2 MyIC SIP Clients within the network (even on different Wifi terminals)

The PABX is on a different IP address to the internal network and we are using a firewall router to join the networks (Routing not NAT)

All SIP registration messages and call setup messages work fine (so that proves routing is OK)
I have run a trace at the PABX port and I get both speech paths in and out. (PABX is OK)
I have run a trace outside the firewall on the internal network side and I get both speech paths. (Firewall router is not the issue)
I have also tried using a different Wifi access point and I get the same issue. I can register other SIP clients on the same network without issue. (WiFi access point is not the issue)

Given that it works fine between 2 MyIC SIP companions proves my configuration is correct

The trace shows that the are using the same g711 codec

The trace shows clear communication between the PABX and the MyIC device

If anyone has any ideas where to go to from here it would be much appreciated. I have been wrecking my brain over this for months

[cavagnaro]

Routing not NAT... What do you mean? The fact that PBX original IP address is masked or changed is NAT and SIP is not friendly with it. You will need to use an SBC.

[cavagnaro]

And the fact that it works between 2 myIC means that they are only doing direct RTP between them.

[royce.clark]

Thank you. You are 100% correct.

I installed a Wifi router on the same network as the PABX with no issue. Looks like a need to redesign the network.

[tot3nkopf]

Thank you. You are 100% correct.

I installed a Wifi router on the same network as the PABX with no issue. Looks like a need to redesign the network.

Or use SIP ALG aware router.

[murraya]

I thought you learned better than that from me royce

[royce.clark]

True Murray.

I knew this was the case for IP phones but thought it would be OK for SIP.

I have got it working now that the firewall is routing not NATing.

I still have one issue. The app is intermittently not ringing, I can still answer the call but no sound. Any ideas???

[cavagnaro]

lol you have the answer...no magic tricks on ICS, just check your network

[murraya]

turn up your hearing aid?