I have a customer who has AT&T as their SIP Provider. I'm looking for some guidance on how I should build a tcl script to allow a transfer connect (connect a PSTN caller on the SIP Gateway to a non-network number, blind transfer, and terminating the call from the SIP Gateway's perspective). For AT&T, they wait for "*8" to be received by the gateway, which triggers a response from the SIP Provider, which awaits a 10-digits from the SIP Gateway. After receiving the digits, the SIP Provider disconnect's the call on the SIP Gateway and transfers the PSTN caller to the appropriate destination.
Now, on a standard Cisco IP Phone, we are not capable of just typing *8 during an inbound call, but, within a CVP script, we can initiate a transfer connect to the SIP provider by playing a WAV file mimicking *8 tones. The CVP script is only initiated through scripting mechanisms, so after the agent receives the call, he/she wants to transfer the call to another non-network number without tying two SIP ports.
I read through the SIP REFER transfer method in the programming guide, but I need to find a way to allow the agent to initiate the tcl script to perform this type of transfer on behalf of the caller. I'm not sure if the tcl script needs to be initiated on the inbound dial-peer and is waiting for something special from the agent phone, or if he needs to do a blind transfer to a dial-peer.
Some guidance would be great. I can't handle programming solid food, so baby talk is preferred. I appreciate whatever help I can get.
