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 Contact: <sip:398@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@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@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