Send SDP Update upon transfer for external trunk (P-Series)

When a call is transfered (attended) to an extension in same PBX the caller ID updates upon completing the transfer to show the original caller id.

Is it possible to have the update happen when the transfer goes through a SIP Trunk to a secondary PBX? I know SIP providers might not support this but it would be very useful when there are several PBX connected.

Already captured a call and tested but the update is not sent when call goes through a SIP trunk.


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