[Asterisk-Users] can a sip.conf stanza be shared by several phones?

[Rich Adamson]

> If several phones register to the same sip.conf section what will happen
> with a "Dial SIP/shared" in asterisk? 
> 
> All phones ringing and the first one to answer gets the call?
> 
> Undefined behavior?

I believe the last one to register will be handed calls destined to
that extension.

If you want multiple phones to ring, then each phone should have its
own unique registration, and your extensions.conf entry should look
something like:
 555,1,Dial(SIP/101&SIP/102,15)