IP Phone to VPN Phone - No Audio

[rtsoi]

One of our VPN phone users has no audio when calling/receiving calls from an on site IP Phone user.

If IP user calls out on the PRI (9+10 digits) they can hear but the VPN user's phone doesn't ring, just flashes an incoming call.

No issues when calling anyone else, only between these 2.

No other VPN or IP Phone users have this problem.

 

[avayaguy23]

firewall issue

 

[rtsoi]

Can you be a little more specific?

Other users who have this setup don't have this problem. It is only between these 2 specific users.

We recently upgraded to CM 8 so could this be a known bug?

 

[avayaguy23]

Run a list trace on the extension in question to figure out what IPs it is talking to. Then review with your firewall team.

 

[jimbojimbo]

A fairly typical issue. Disable direct-ip on the VPN user network region and anchor the call at the core. list trace station to see the connections and verify the connectivity is VPN Phone<->Core DSP<->on-Net station. If you get voice in this scenario but not when direct IP then the network team is restricting access. You can also run a trace route in CM between the phones.