Call forward to an external VoIP number

[SVciscomio]

Hi,

I noticed an issue related to call forward.

If I forward a DN to a PSTN number, it works fine but If I forward the same DN to a VoIP number of an external provider, it doesn't work.

Thanks

[Manish Gogna]

Hi,

You need to provide more details about the scenario where the call fails. What is the call flow? Which call control is being used ( CUCM / CME )? is the call going out via a SIP/H323 trunk to the external VoIP number ? Does the call work if you call the external VoIP number directly from your IP phone? If CSS/partition level settings are okay then you should get the detailed call manager service trace for a failed transfer to see why the call forwarding is failing.

Manish

[SVciscomio]

Hi Manish,

I'm usign CUCM 10.5; the call is going to the external VoIP number by the voice gateway (MGCP); If I call the external VoIP number directly from my IP Phone, it works; the CSS/partition level is correct.

Thanks

[Manish Gogna]

So, are you trying to send a call to a VoIP phone on another enterprise using MGCP? The forwarded call will reach the MGCP gateway ( you can check if via "debug mgcp packets" ) but how is the MGCP gateway connected to the other VoIP system? Can you provide the full end to end integration details between the two VoIP systems.

Manish

[SVciscomio]

VoIP Phone --> CUCM 10.5 (with Voice Gateway registered via MGCP) --> E1 PRI (to PSTN) --> ... --> VoIP Phone of a public voice service provider