https://tools.ietf.org/html/rfc3261#section-10.3

      8. The registrar returns a 200 (OK) response.  The response MUST
         contain Contact header field values enumerating all current
         bindings.  Each Contact value MUST feature an "expires"
         parameter indicating its expiration interval chosen by the
         registrar.  The response SHOULD include a Date header field.

On Dec 17, 2018, at 9:13 AM, sagar malam <sagarmalam@gmail.com> wrote:

Thanks for reply Micheal.

I dont want to disable multiple registrations.And i agree all the registrations are genuine.

But my problem is that when FS responds to Register Request using 200 OK, The 200 OK has contact headers of all the registrations( of other SIP clients).As shown in below packet, there are three contact headers.I think there should be only one. 

============================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@example.com>;tag=22CE54C0-84BCCF23
To: <sip:398@example.com>;tag=e8Fa2tND4U80D
Call-ID: d66f0f0592c09746b903406f312eb0c2
CSeq: 590 REGISTER
t=tcp>;expires=379
ort=tcp>;expires=245
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

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

Also i have compared this behaviour with OpenSIPs and Kamailio, They send only one contact header.

Thanks in advance.



On Wed, Dec 12, 2018 at 3:08 AM Michael Jerris <mike@jerris.com> wrote:
These are all valid current registrations, there are params you can adjust for multi reg that will replace previous registrations instead of allowing multiple.

On Dec 9, 2018, at 1:17 PM, sagar malam <sagarmalam@gmail.com> wrote:

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@example.com>;tag=22CE54C0-84BCCF23
To: <sip:398@example.com>;tag=e8Fa2tND4U80D
Call-ID: d66f0f0592c09746b903406f312eb0c2
CSeq: 590 REGISTER
t=tcp>;expires=379
ort=tcp>;expires=245
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