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