Thank you Gang for your input here. According
to the Wikipedia page on B2BUA:
The Back-to-Back User Agent (B2BUA) acts as a user agent to both
ends of a Session Initiation Protocol (SIP) call. The B2BUA is responsible
for handling all SIP signalling between both ends of the call, from call
establishment to termination. Each call is tracked from beginning to end,
allowing the operators of the B2BUA to offer value-added features to the
call.
and,
A Signaling gateway, part of a Session Border Controller, or Asterisk PBX are good
examples of a B2BUA.
The last statement particularly puts me off, as the
SBC page on Wikipedia also suggests that "Signalling Mode" GnuGKs also function
as a partial SBC. Is this correct? Or am I missing
something?
Regards
HASSAN
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