[Asterisk-Users] about sip and registering

[Andrea Riela]

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Hi folks,

I don't really understand the extension function on:

register => user:secret:authuser at host:port/extension

First question
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well, it's only local, or is important for authentication on external 
sip server?
Example: I've one external sip account, the number is the URI also 
(111), pass 'xxx'

I'll do something like:

register => 111:xxx at extsipserver:5060/111

or the last '111' could be for example 555 (only for local call 
routing)? If I use '555', trying to call another external SIP user I 
will 111 or 555 (problem for authentication)? I don't know if that's 
enough clear.

Second question
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if extension is only an internal number, this could be on another PBX 
(like callmanager), and I reach this with a specific pattern?

Thanks for your support
Regards
Andrea
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