Bridged Line Appearance Signaling - Polycom SoundPoint IP 300 Administrator's Manual

Administrator's Guide - SoundPoint

5.2.5 Bridged Line Appearance Signaling

A bridged line is an address of record managed by a server. The server allows multiple
end points to register locations against the address of record.
The phone supports bridged line appearances (BLA) using the SUBSCRIBE-NOTIFY
method in the "SIP Specific Event Notification" framework (RFC 3265). The events
used are:
• "dialog" for bridged line appearance subscribe and notify
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IP Session Initiation Protocol (SIP)