I am new to OpenSIPS and I am trying to configure it as SBC between MS Teams
(with TLS connection) and a FreePBX/Asterisk server (with UDP connection) with
a private IP address.
In order for MS Teams to send the ACK to 200 OK reply through the same TLS
connection it used to send INVITE request I have to configure OpenSIPS to send
Contact header with URI containing its FQDN instead of its IP address.
Unfortunately topology_hiding module sets IP address, so MS Teams tries to
create a new TLS connection and most probably refuses the certificate, because
it contains FQDN, not IP address.
I tried several approaches with configuring OpenSIPS:
- changed socket to be with FQDN and alias with IP address - topology
hiding still sets IP address in Contact header
- tried to add manually second contact header - it was not recognized
by MS Teams (it still used the first one and tries to create a new TLS
connection) and I could not add thinfo parameter, needed by topology_hiding
module
Is there another module in OpenSIPS which allows modifying Contact URI only of
a reply?
Also I think that I have to add record-route header in my 200 OK reply,
according to OpenSIP how-to:
UPDATE: Starting from 01.07.2020 Microsoft requires Route headers with SBC_FQDN
in SIP replies too. Instead of simple record_route() for SIP request from MS
servers OpenSIPS should add FQDN, but in different order:
record_route_preset("LAN_IP:5060", "SBC_FQDN:5061;transport=tls");
add_rr_param(";r2=on");
I tried to add it in the main route script before calling topology_hiding() in
order for it to be restored on replies, but this didn't work:
record_route_preset("sbc.tbgit.com:5067;transport=tls");
I noticed that topology_hiding creates a branch, so I tried to add the same
record_route_preset in the branch_route also, but this didn't help - I just
receive:
ERROR:rr:w_record_route_preset: Double attempt to record-route
Any help is welcome.
Peter
Data Classification: Confidential
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