asterisk users - May 2005 - Restricting connection of unauthorized phones.

I have asterisk up and running now, and installed XLITE on 2 PC's. Both
machines (mistakenly) registered as the same user / extension.

Strangely, asterisks allows this and both phones can make calls! But,
only the first one to register can receive calls at the extensions.

1. Is this normal behavior? (Why allow 2 phones on same extension) 

2. Why is asterisk not showing the second phone when I type SIP SHOW
PEERS?  Only the first (with the same extension) shows.

3. Is there some way to make asterisk NOT allow phones to connect on an
extension already in use?

4. Is there a way to make asterisk NOT allow phones to connect that do
not have a valid extension in SIP.CONF?

Thanks,

Mike

1. Yes, its how SIP works.  The phone registers to let * know where it
is.  If another phone registers with the same credentials, * updates its
sip peers list -- the phone with the most recent successful registration
will show in that list.  Asterisk doesn't know whether you moved the
first phone, or are registering a second phone.

2. See above -- Asterisk can only register one phone to an extension.

3. See above -- how is * to tell whether the same phone isn't
registering from a different location, and/or re-registering (which SIP
phones DO periodically).  In short: No.

4. If you don't have valid credentials in sip.conf, then of course the
phone can't register, so it won't be able to receive calls.  In order to
prevent a phone from dialing through your * server, simply set up the
general context to be something like "dontdial" and setup that
[dontdial] context to not allow dialing through.

* It should be noted that most SIP clients will not allow dialing unless
they're registered to the server.  Of course, in your scenario, both
clients *think* they're registered, so they'll allow you to dial through
the server; in addition, they have valid credentials, so * will allow
them to dial anyway.
> -----Original Message-----
> From: Michael Stahl [mailto:mstahl@ocg.ca] 
> Sent: Tuesday, May 10, 2005 9:29 PM
> To: asterisk-users@lists.digium.com
> Subject: [Asterisk-Users] Restricting connection of 
> unauthorized phones.
> 
> 
> I have asterisk up and running now, and installed XLITE on 2 
> PC's. Both machines (mistakenly) registered as the same user 
> / extension.
> 
> Strangely, asterisks allows this and both phones can make 
> calls! But, only the first one to register can receive calls 
> at the extensions.
> 
> 1. Is this normal behavior? (Why allow 2 phones on same extension) 
> 
> 2. Why is asterisk not showing the second phone when I type 
> SIP SHOW PEERS?  Only the first (with the same extension) shows.
> 
> 3. Is there some way to make asterisk NOT allow phones to 
> connect on an extension already in use?
> 
> 4. Is there a way to make asterisk NOT allow phones to 
> connect that do not have a valid extension in SIP.CONF?
> 
> Thanks,
> 
> Mike
> 
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