[Asterisk-Users] Parking for SIP phones.

[William Zhang]

Hi,

There were a lot discussion regarding Parking recently, but I wonder if
people had tried to Park a call on a SIP phone.

If I understand correctly, * does NOT support parking for SIP phones.
So I want to solicite some comments regarding Parking for SIP, and here
is what I think:

1. It does not matter what caller is, i.e., another SIP phone, PSTN
call, etc.

2. Callee, which is a SIP phone, will use transfer(REFER in SIP) to
transfer the call to *, which is hosting parking extension say, 700.

3. Any other SIP phones, who dial extension 700(*), will get bridged to
the caller, or * will use reInvite to make the caller and callee talk
to each other directly if both the caller and new callee are SIP
phones.

4. The original Callee will be NOTIFYed with a SIP NOTIFY message about
the Parking.

5. There is a draft: draft-ietf-sip-replaces-03.txt, which might be a
more standard way of doing parking for SIP. I just found out. Maybe
that's the way to go.

Two issue here I have not figure out:

1. How to notify the orginal caller about which extension the call was
Parked on? IMHO, it's not a big problem if I can pick up the call from
another extension. So, let's call this way of parking "Blind" Parking.

2. How do I park the call in a multiple parking extension * setup?
Which extension should I use?  Or should * handles the multiple Parking
extension and NOTIFY the original callee, with either a parking
extension showing on LCD or with a voice telling it which extension its
call is parked on?