27 Nov
2023
27 Nov
'23
9:16 a.m.
Hello,
On 27.11.23 14:04, Benoit Panizzon via sr-users wrote:
Hi List
Two Kamailio Nodes situation.
Node A: Routing Instance.
Node B: Registrar Instance.
An invite is sent from Node A to B.
Customer registered on B is 'busy' as example.
B initiates Call Forwarding by adding a Diversion Header and sending
the Invite back to A with a new R-URI towards the CFB destination.
The Invite sent from B to A still has Node B in it's Record-Route. So
all subsequent SIP messages pass via B, which is not needed and cause
issue with rtpengine running on B.
I attempted to remove_record_route(); when sending the call back to A,
but this causes:
parse_headers(): bad header field [;lr;ftag=3910078620-883101371>
It looks like only the beginning of the RR header is removed leaving
back a competely broken line.
What is the propper was to remove a node from RR and Via routing?
the B should not do record_route() when forwards back INVITE to A.
Via is for routing back replies, if you remove it, node B does
retransmissions because it does not receives any response and will also
send a failure code at some point.
Alternative is to send 302 or something else back to A, which does the
redirect using script operations to fetch the contact address or
uac_redirect module.
Cheers, Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
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