Call Connecting but no Voice

[GRANT3779]

Hi,

I have an issue where a call connects and the duration timer begins to go up on the call but neither party can hear each other. Routing between all the end points. The call flow/scenario is below -

External call comes into our office over ISDN lines, hits the VG and then Unity AA (prompting for extension)

Calling Party enters the extension they want to reach.

The entered extension is located on a remote CME over the WAN.

This is configured as a GW on our CUCM Cluster

Call is routed over the WAN to the remote CME/Phone

Does this sound like a media issue of sorts? Not to sure on the best way to begin troubleshooting this one.

[Manish Gogna]

Hi,

You can first try calling into Unity Connection from an internal IP phone and see if the issue persists. If the internal call works fine then you should start by getting the debugs from the gateway to check the signaling part which will show if correct IP addresses, port numbers and codecs are advertised and negotiated. If signaling looks good then most likely it is something on the network ( any routing issue, firewall blocking ports etc ).

Manish