[OpenSIPS-Users] SUBSCRIBE + Topology Hiding

Royee Tichauer royee.tichauer at vonage.com
Thu Dec 14 10:45:35 EST 2017


I am using opensips 2.1 and I'm experiencing some weird behavior with
SUBSCRIBE handling on an opensips server that is behaving as a SIP proxy. I
also use the topology_hiding module to hide routing information from the

The proxy receives an initial SUBSCRIBE from a device, the SUBSCRIBE
doesn't contain a "to tag" so I process it like a normal SUBSCRIBE message
and route it to the correct route which replies with a 200 OK with a "to
tag". Some time before the expiration of the SUBSCRIBE is passed I receive
a another SUBSCRIBE, this time with a "to tag" so my opensips config file
attempts to match it to a topology matching but for some reason it fails to
match it.

I have this configured:

modparam("dialog", "dlg_match_mode", 0)

Any idea why the second subscribe message is not being matched?

Attached is a capture of the initial and following subscribes.


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