Hi I installl freeswitch debian jessie 8.9 server. i register 2 extension (1001,1002)using tryjs sip when i call one to other it response SIP/2.0 422 Session Interval Too Small Via: SIP/2.0/WSS 7j9v0vaho6jt.invalid;branch=z9hG4bK2460026;received=123.231.122.157;rport=43751 From: "jay" <sip:1002@webrtc01.resolve1.com>;tag=gc5ckl91vp To: <sip:1001@webrtc01.resolve1.com>;tag=mtB2UD7UDgpHB Call-ID: s8slq1jnq7o7ic92lbo6 CSeq: 5609 INVITE User-Agent: FreeSWITCH-mod_sofia/1.9.0-1785-9d96741~64bit Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE Supported: timer, path, replaces Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer Min-SE: 120 Content-Length: 0 I change the below line <param name="session-timeout" value="1800"/> <param name="enable-timer" value="true"/> <param name="minimum-session-expires" value="120"/> but still get that respone could you help me -- Best Regards, *Supun Madushanka* [Undergraduate] University of Moratuwa. http://www.mrt.ac.lk Department of Computer Science and Engineering. http://cse.mrt.ac.lk Mobile: +94 71 1135012 <%2B94%280%29%20711135012> E-mail: supun.12@cse.mrt.ac.lk