Media Description, name and address (m): audio 23180 RTP/AVP 9 101
Status-Line: SIP/2.0 183 Session Progress
(a): rtpmap:84 speex/16000 Media Attribute (a): fmtp:120 useinbandfec=1 usedtx=1 maxaveragebitrate=64000 Media Attribute Media Description, name and address (m): audio 64836 RTP/AVP 9 8 120 0 84 101 Session Description Protocol Version (v): 0 Analysis of 1008 callingġ008 launched INVITE message packet analysis to freeswitch SDP also placed the body of the SIP protocol (body) in 3.3. In the SIP session is established, SIP protocol includes information related to the media (e.g., video and audio), the relevant media data will be included in the SDP.
XLITE SOFTPHONE SENDING DOUBLE CALLS HOW TO
The first question: between 10 is how to know the IP address of the other RTP packets or other UPD packet interaction? The answer is that by SDP to know each other. rtp packet transmission is used on UDP, and 10 are intranet, fs deployed to the public network, so this is also directed to the problem of NAT But the call transfer information between them using the rtp is UPD package or other packages, and rtp package or other UPD packet data transmission is not sip protocol has been established on the line, but the use of a transmission line outside do not, guess all possible 10 packets are not successfully transferred to freeswitch, resulting in can not hear Normal process, the establishment of a call between the sip protocol 10, 10 does not transmit the voice packet directly to each other, but are sent to the first FreeSWITCH, forwarded to each other by a freeswitch. It has been carried out between xlite normal interaction sip protocol, and the 10 calls have been through, but the 10 impossible to hear each other. On 172.23.4.92, tcpdump captures all packets in the communication processįor security, we put the public address real environment, all use fake addresses to be replaced 3.
Softphone usage x-lite, using default freeswitch two numbers 10.įreeswitch deployed in the server's private IP address is 172.23.4.92, public address 115.aa.aa.aa.ġ008 testing machine in the private network (IP is 10.240.80.69), by 115.aa.aa.aa: 5060 registered freeswitch, but went out after the public address is 59.bb.bb.bb.ġ018 testing machine in the private network by 115.aa.aa.aa: 5060 registered freeswitch, but went out after the public address is 123.cc.cc.cc freeswitch how to implement NAT traversal issues of 2. This article addresses the following questions: have normal interaction sip agreement between xlite, 10 and have a call-through, but the 10 impossible to hear each other.Ĭauses 1.