Hi All,
We recently got SIP trunks installed and in the process of setting these up we've come across a problem when making a call through the SIP trunks. An outgoing call through the SIP trunk is able to be established, but once established there is no speech and then after 5-10 seconds the call is then dropped.
Intertel CS5000 5.1.0.36
Processor Card 10.31.1.3
Processor Expansion Card 10.31.1.2
Audiocodes Mediant Gateway 10.31.1.4
Having a look at the packet capture the SIP invite packet from the Processor Card (10.31.1.3) sends the connection information for RTP packets as 10.31.1.2, port 7218. Then when the Mediant Gateway (10.31.1.4) starts sending RTP packets to 10.31.2, port 7218 as stated from the SIP Invite packet an ICMP reply is send from the Process Expansion Card (10.31.1.2) back to the Mediant Gateway (10.31.1.4) saying that the port is closed... See attached for the packet captures.
So what I can tell is that the PC is either sending out the wrong port number or the port isnt opening on the PEC. Each time a new call is made the RTP port changes, but its the same outcome.
Any help would be greatly appreciated.
Cheers
Andrew
