หลังจากแก้ที่ Router มี msg.
########################
U 192.168.236.29:5060 -> 61.90.185.178:5060
INVITE sip:0839978178@sip.kallkool.com:5060 SIP/2.0..Via: SIP/2.0/UDP 110.7
7.227.217:5060;branch=z9hG4bK39613a4e;rport..Max-Forwards: 70..From: "Meeti
ng Room B4" <sip:0027626143@sip.kallkool.com>;tag=as48160f82..To: <sip:0839
978178@sip.kallkool.com:5060>..Contact: <sip:0027626143@110.77.227.217>..Ca
ll-ID:
1a38243010182fe750056f2e188b8a75@sip.kallkool.com..CSeq: 102 INVITE.
.User-Agent: FPBX-2.8.1(1.6.2.13)..Date: Sat, 25 Feb 2012 09:10:33 GMT..All
ow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO..Supp
orted: replaces, timer..Content-Type: application/sdp..Content-Length: 265.
...v=0..o=root 2068412630 2068412630 IN IP4 110.77.227.217..s=Asterisk PBX
1.6.2.13..c=IN IP4 110.77.227.217..t=0 0..m=audio 10920 RTP/AVP 0 8 101..a=
rtpmap:0 PCMU/8000..a=rtpmap:8 PCMA/8000..a=rtpmap:101 telephone-event/8000
..a=fmtp:101 0-16..a=ptime:20..a=sendrecv..
#
#####################################