This chapter aims to explain how to use some of the features available to
manipulate party ID information. It will not delve into specific channel
configuration options described in the respective sample configuration
files. The party ID information can consist of Caller ID, Connected Line
ID, redirecting to party ID information, and redirecting from party ID
information. Meticulous control is needed particularly when
interoperating between different channel technologies.
- Caller ID: The Caller ID information describes who is originating a
call.
- Connected Line ID: The Connected Line ID information describes who
is connected to the other end of a call while a call is established.
Unlike Caller ID, the connected line information can change over the life
of a call when call transfers are performed. The connected line
information can also change in either direction because either end could
transfer the call. For ISDN it is known as Connected Line Identification
Presentation (COLP), Connected Line Identification Restriction (COLR), and
Explicit Call Transfer (ECT). For SIP it is known either as
P-Asserted-Identity or Remote-Party-Id.
- Redirecting information: When a call is forwarded, the call
originator is informed that the call is redirecting-to a new destination.
The new destination is also informed that the incoming call is
redirecting-from the forwarding party. A call can be forwarded repeatedly
until a new destination answers it or a forwarding limit is reached.
lmadsen
2010-10-21