Hi
Trying to use overlap dialling with SIP I found something which is not
claer to me (according SIPbis2 draft).
As I understood after the initial INVITE the UAC can send additional
digits in the Request URI of new INVITE methods to the GW. The final
reponse 484 Address Incomplete is used to indicate that additional
digits are needed to complete the number.
Unfortuanelly a GW to the PSTN does not know when a number is complete
and therefore cannot send 484 Response (or only after a timeout). The
UAC itself cannot send a re-Invite before receiving a Final Response. So
the only possible way would be a retransmission of the inital INVITE
with a different Request URI which in my understanding is not allowed.
Did I miss something?
Does anybody know how overlap dialling is to be done?
TIA
Christof
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