[SIPForum-discussion] Parent Child registration vs Wildcard registration

[Zweig, Greg]

All,

 

I was curious to get forum members' opinion on the two prevalent methods
of registering users that are behind a PBX.  Some carriers use a parent
child registration that creates a concept of an "alpha" subscriber while
others create a wild card so that subscribers within a group can more
easily be registered together.   I believe the latter was created by
Cisco

 

Using the parent child method, the PBX creates a binding between one of
its phone numbers as the address of record (AoR) and Contact-URI in the
REGISTER message. The registrar understands that a single AoR actually
represents many addresses, and so it registers them implicitly. 

 

Using the wild card a "." in the address serves as the wild card - up to
32 digits-- so that a variety of users at the same address can be
implicitly registered 

An example might look like Contact: <sip:12345..... at 15.3.33.29:5060>

 

I would appreciate any practical experience forum members have that
would provide advantages or disadvantages for the two methods.

 

Thanks, 

 

Greg 

 

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