[OpenSIPS-Users] Ack without To tag

[John Nash]

I am using opensips 2.1 with topology_hiding module. I have an issue only
with one SIP endpoint. This endpoint sends Ack message (after 200 OK to
Invite) without any to tag because of that it is not matching with In
dialog request section.

Can a UA send ACK without to tag?...If yes any way I can match it with
ongoing dialog?

John
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