It seems that 3pcc would be the ideal way of performing a call transfer. Say a caller is transferred by a callee. You could split the caller into parts A and B. Part A would receive the REFER message and sendCmd that to part B. Part B would then recvCmd and initiate a second call with a new call-id directed towards the number in the Refer-To header.
I'm having a practical problem with implementing this, however. Because I'm sending all messages through a proxy, I need to register with that proxy. Both parts of the caller need to be bound to the same port for the proxy to recognize the messages as coming from the same registered user, but this is impossible, as they need to run at the same time to do the sendCmd and recvCmd.
Does anyone know of a way around this (using 3pcc or something else) short of changing source code?
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