[Freeswitch-users] Disabling 200 OK with contact headers of all the lines

[sagar malam]

Hello ,

I am using FS SLA feature and it works very well.However i am facing an
issue of registrations getting dropped as explained below :
There are 3 phones registered with same extension number.Sofia is
configured with "sip-expires-max-deviation" to randomise registration
through expiry header in contact header.All the phones are Polycom. In case
of shared lines FS adds contact header of all the lines(or phones with same
extension) in 200 OK as shown below due to which all the phones are reading
expiry timer from first contact header only.So in below example,Phone re
registers after 379 seconds(first contact header) instead of 88
seconds(third contact header) leading to registration expiry on FS.

Reason why phones are always reading expiry from first contact header is
same Public IP(contact is re written by Proxy in front of FS)  for all
three phones which is confusing phone to identify its own contact header.
Is there any way to configure FS to not send contact headers of all the
registrations but only one that belongs to the line itself ? or any other
way to fix it.
============================200 OK for register packet =============

2018/12/08 13:36:35.426099 10.50.7.251:5070 -> 10.50.7.253:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 66.160.237.253:5060
;branch=z9hG4bK9b46.f9b7a68125108f411537617d02bd48f8.0;received=10.50.7.253
Via: SIP/2.0/UDP 198.136.236.1:5060
;rport=5060;received=10.50.8.1;branch=z9hG4bK9b46.e6f1aa3817a238f499aa3aafa4217425.0
Via: SIP/2.0/UDP
172.16.1.11;rport=1426;received=71.239.113.14;branch=z9hG4bK1df2302cD062D28F
From: "Main Line" <sip:398 at example.com>;tag=22CE54C0-84BCCF23
To: <sip:398 at example.com>;tag=e8Fa2tND4U80D
Call-ID: d66f0f0592c09746b903406f312eb0c2
CSeq: 590 REGISTER
Contact: <sip:398 at 71.239.113.14:1071
;alias=10.50.8.1~5060~1;x-nat=yes;pv-ip=172.16.1.12;pb-ip=71.239.113.14;pb-pt=1071;mac-address=64167f2ec274;transp
t=tcp>;expires=379
Contact: <sip:398 at 71.239.113.14:56478
;alias=10.50.8.1~5060~1;x-nat=yes;pv-ip=172.16.1.13;pb-ip=71.239.113.14;pb-pt=56478;mac-address=64167f2ebd54;tran
ort=tcp>;expires=245
Contact: <sip:398 at 71.239.113.14:1426
;alias=10.50.8.1~5060~1;x-nat=yes;pv-ip=172.16.1.11;pb-ip=71.239.113.14;pb-pt=1426;transport=udp;mac-address=64167
eb0c2>;expires=88
Date: Sat, 08 Dec 2018 08:06:35 GMT
User-Agent: FreeSWITCH-mod_sofia/1.6.17~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER,
REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: path, replaces
Content-Length: 0

===========================================================

-- 
Thanks,

Sagar
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