Top "Sip" questions

The Session Initiation Protocol, defined in "RFC 3261", is an application layer signalling protocol for establishing and modifying long-running relationships between two or more peers.

Asterisk to asterisk call: 403 Forbidden

I have 2 servers with Asterisks on them: 192.168.241.98 and 192.168.243.112. There is a valid registration on the first: register => wagateway:[email protected]:5060 …

debugging asterisk sip trunk
Android as SIP to GSM gateway

Soon I could use a SIP to GSM gateway, because I'll need to make phone calls from Germany to a …

android sip gsm gateway
In SIP, why the Contact header field MUST be present in the Invite request

Usually, the Contact header field in the Invite request is useless. For example, the UAC and the UAS are in …

sip
Asterisk : originate call doesn't set the CALLERID in the dialplan

I am using Asterisk PBX to call a softphone, i use thise command : "originate SIP/100 extension 4004" , in the dialplan, I …

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No audio on Asterisk SIP call

I almost managed to init a 2 sided call (click to call): 1st to my office and the 2nd to my …

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CSRC and SSRC in RTP

I am very new to RTP , can some one explain about the CSRC and SSRC in general? From http://www.…

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How to build a softphone (using SIP protocol) using C#

I have this challenge to build an sip softphone using c# or .net technologies. Please guide me the technology, requirements …

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How to implement VoIP + SIP in iPhone?

I want to develop a VoIP application for iPhone . But I don't know the basics of VoIP concepts and also …

iphone sip voip
Difference between session, dialog and transaction in SIP?

What exactly is the difference between a session, a dialog and a transaction? Does all must be present together?

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Minimum SDP for making a H264 RTP stream?

I'm looking for an example of a minimum necessary SDP for setting up a H264 video stream.| The assumption is …

sip h.264 rtp sdp