[asterisk-users] Asterisk question

Leandro Dardini ldardini at gmail.com
Wed Feb 20 03:01:26 CST 2013

2013/2/20 Nguyễn Công <nguyencong.1210 at gmail.com>

> Hello everyone, I’m new to Asterisk and I have a question. There is a
> phone call between two users, then they are talking to each other directly
> or by the server. I mean all packets from the user A to user B will be send
> directly to each other or will those packets from user A must be send to
> server and server will send to user B.****
> Thanks.****
> --

Both cases can happens. In a VoIP call we have two connections, one is used
for signaling, usually port 5060 for SIP protocol, UDP transport and one is
used for media (voice), usually random port. When the call starts the
asterisk server sits in the middle of the media path, meaning all voice
packets from phone A go to asterisk server and they are rerouted to phone
B. After few milliseconds, if configured this way, asterisk server
instructs the phone A to send the media directly to phone B to save
bandwidth. It is named "reinvite"

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