No Audio on Remote VPN/IP 9608 Phone registered with one IP Office and hotdesk as different IPO SCN

[adc110]

I have a situation where a remote VPN/IP phone (9608) is unable to have any audio (in or out) when receiving calls from their hotdesk extension from an SCN IP Office.

Here is a brief overview of design:

We have (6) IP Office V2 systems (11.0.x) in an SCN. Our core/hub IP Office system has IP Office/H323 Trunks setup directly with all the remaining (5) IP Office systems (hub & spoke). For simplicity I will focus on the issue with the core/hub IP Office system (SYSTEM A) and a remote IP Office system (SYSTEM B).

SYSTEM A has 9608 remote VPN phones. The VPN tunnels terminate at the main site where SYSTEM A resides and are registered with SYSTEM A. Telephony features work fine if the remote VPN phone is logged in as an extension that is registered/active with SYSTEM A. However, if the user HotDesks as an extension on SYSTEM B, the user logs in fine however this is where we start to have some challenges. If someone calls into their DID on SYSTEM B . . the calls passes successfully to the remote VPN phone however inbound/outbound audio does not work. If the SYSTEM B user calls outbound audio is fine (my guess is because the calls are being directed out of SYSTEM A’s PRI trunks since the base VPN phone is registered with SYSTEM A. The issue seems to be somewhat related to calls coming into SYSTEM B’s PRI circuits and then passed to a VPN phone registered with SYSTEM A (and hotdesked as a SYSTEM B user).

We also tested having some SYSTEM B users simply call the hotdesked SYSTEM B user that is logged into the remote VPN phone and the same issue persists. All other types of calls between the SCN ip office systems work fine with no audio issues (extension to extension). So, I am not convinced that the PRI/carrier circuits are related to the issue but somehow appears to be related to a remote VPN Phone that is registered to one IP Office (SYSTEM A) but then hotdesked as a SYSTEM B user?

If anyone has any thoughts as to what to check (configuration wise) that would be great! Thank you for any input in advance

 

[dagwoodsystems]

Select the Extension from the left pane (not User) and click on the VoIP tab. If "Allow Direct Media Path" is checked, then uncheck and save. See if that does it.

Tim Alberstein

 

[derfloh]

Direct network connection between the VON phone and the SCNed site is not possible. Tim‘s hit should solve it.

IP Office remote service
IP Office certificate check
CLI based call blocking
SCN fallback over PSTN

 

[IPGuru]

Disabling Direct media path only proves the issue is with the network routing & should be considered as a temporary work around until the data team can fix the routing between the different networks


Do things on the cheap & it will cost you dear

ACSS

 

[adc110]

Thank you all! This was the issue and I really appreciate it. For this purpose we really don't need any routes back to the Remote VPN phones (too few of them to warrant building out direct routes). Thank you all for your input on this!