Dear Brian, Thanks for your reply. I’m test the feature with our phone, I follow the draft-anil-sipping-bla-03.txt to to the test. Could you tell me what’s wrong with SIP flow. Thanks a lot. Best Regards, Bryan _____ From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Brian West Sent: 2010年4月7日 10:51 To: freeswitch-users@lists.freeswitch.org Subject: Re: [Freeswitch-users] SLA/BLA issue(sofia_presence.c:2139 Gatewayinformation missing) You can't do BLA/BLF from FS to FS with a register... what phones are you using? /b On Apr 6, 2010, at 8:09 PM, Bryan wrote: I see that both the server and the phone subscribe to each other, but the last NOTIFY from the phone to the server gets rejected with "Call does not exist". On the console I get the following error message: [ERR] sofia_presence.c:2135 Gateway information missing.