This is much easier to implement than single line extension.
A phone that is registered for some AOR will typically receive invites
for calls to the AOR whether it is currently in a call or not. What it
chooses to do about those is a local implementation issue. If you want
the phone to place a ringing indication on a different "line" on the
phone, go right ahead and do so.
And with two phones, all you need do is register them both to the same AOR.
Paul
Roy Yang wrote:
> Hi, All
> In analog world, for one 2-line phone, we can register 2-phones with
> same phone number through PBX.
> When you are calling through line 1, and you can issue another call or
> accepting another call through
> putting line 1 on hold, and dial another number . Also, you can switch back
> to the line 1 by placing line 1 button.
> Another scenario is that you have two phones in one room, and you are
> calling on line 1, and you can pick up
> a call or initiate another call through another call on line 2.
>
> This feature is different from single line extention described in
> draft-ietf-sipping-service-examples-10.
>
> Do somebody know how to implement this feature or it has been defined
> in some RFC document?
>
> Thanks a lot!
>
> Regards
>
> -Roy
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