#2873 Sporadic app sent two contacts in REGISTER message

[Anonymous]

Originally created by: stoja...@gmail.com

What steps will reproduce the problem?
1.Sometimes app has sent two contacts in REGISTER
Contact: <sip:5ZaTk5rZCKgFprLWBil6@172.31.42.112>;expires=900;reg-id=1;
+sip.instance="<urn:uuid:00000000-0000-0000-0000-0000e922f243>"
Expires: 900
Contact: <sip:+gsDTFIKKQEskUgn1CzM@172.31.42.112>;expires=0

2. SIP server rejects REGISTER with
SIP/2.0 400 Invalid Request (more than one contact in REGISTER)
3.

What is the expected output? What do you see instead?

Is it possible to block sending two Contacts header in REGISTER

What version of the product are you using? On what device / operating
system?
CSipSimple 1.02.03 [r2457], HTC mini , Android 4.4.2,
HTC Sense version 6.0, Software 4.14.401.1, HTC SDK API level6.20
Kernal version 3.4.10-g3862988

Please provide any additional information below.

[Anonymous]

Originally posted by: r3gis...@gmail.com

Contact: <sip:+gsDTFIKKQEskUgn1CzM@172.31.42.112>;expires=0  
==> this means "unregister previous contact".
This is SIP valid. It's used because the previous registration is known as being obsolete and tries to unregister it to a register a new one.

Some buggy sip servers does not support that (while it's totally valid according to sip specs). In this case, you can enable a workaround setting in csipsimple account config so that csipsimple instead unregister first, and then register later.
It does not work with "try to clean registration" option however that takes advantage of a hook in registration (while legacy re-register is directly supported inside pjsip stack).

More info on how to use the "legacy" way to unregister :
https://code.google.com/p/csipsimple/wiki/FAQ?wl=en#I_receive_calls_twice_/_Registration_is_done_on_the_sip_server_t

If you have control on sip server, a better way is probably to upgrade it or fix it if it appears to lead to problems on server side. CSipSimple will not be the only app that could behaves this way since it's something valid regarding RFC (and other apps might not have an hidden expert option to change the way it re-register)

Status: WrongConfig

[Anonymous]

Originally posted by: stoja...@gmail.com

Thanks,

It works when I've disabled "Try to clean registers".

Thanks again