Hello Community,
I am facing an issue with VoIP and wanted to see if anyone con help us. Some details about our scenario:
2 X 1900 gateways in HA, centrally managed.
Local PBX is behind the gateway.
3 external PBX are connected to the cluster.
The local PBX is NATed with a different IP address for the external PBX's.
This gateway manages 3 SIP trunks, all have the topology Proxy to Proxy, according to ATRG: VoIP, access and NAT rules are configured according the the ATRG. One of them is used only for outgoing calls, this one is working fine. The other 2 SIP trunks are used for incoming calls. These have problems (one way audio only). After we connect the SIP trunks, it works fine for 1-2 days, after that the phone that initiates the call (it is outside the network) does receive audio correctly, however the internal phone has no audio. After some tshooting, we noticed the SIP payload is not NATed correctly so the external PBX does not send the SIP ACK packet and RTP.
Our workaround is to move the SIP trunk connection, to a locally managed 1430 appliance, here it works fine all the time. When we need to replicate the problem, we move the SIP trunk back to 1900 cluster, wait 1-2 days and the issue appears again.
I wanted to ask if someone faced a similar behavior and could provide some guidance. We have a case open for this issue, but did not find a solution yet and customer is getting nervous with this issue.
Any help will be greatly appreciated, thanks in advance.
Regards
