AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 219)

MaxCS 7.5 Administration Manual 203
C H A P T E R
16
Setting Up IP Extensions
IP phones communicate with the system using SIP protocol to establish the signaling channel and media
channel (the voice steam, using RTP protocol). With SIP implementation, the system establishes a signaling
channel to an IP phone when the IP phone is in use.
Figure 124. Concept of signaling and media channels
The media channel (voice stream) is connected between two IP phones under normal operation. There are
some special situations that require you to configure the IP phone to connect its voice stream to the server.
Please see “Setting an IP Extension” on page 207 for information.