Altigen ACM 6.7 Administrator's Manual page 228

Figure 107. Signaling and media channel between two IP phones
Signaling Channel—A SIP signaling channel communicates between the system and
the IP phone to perform call control, including call setup, tear down, registration, and
phone feature access. The signaling channel implementation consists of the following
elements:
• SIP Virtual Board—Establishes a logical board ID relationship with other types of
physical boards in the system (displayed on Board View window as SIPSP board).
SIP Signaling Channel—Creates SIP signaling channels for IP Extensions (access
•
through SIPSP board, Channel Group configuration).
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MAXCS ACM 6.7 Administration Manual