[asterisk-users] More than one route to a destination

[James Courtier-Dutton]

Hi,

I have a setup with 5 remote offices, each having a Asterisk PBX.
I then have a central office, also with an Asterisk PBX.
The remote offices have 2 links to the central office, a large link,
and a smaller, but more reliable link.
Unfortunately, using IAX is not an option for me.
Can I use 2 SIP Trunks from each remote offices to the central site
and permit 2 simultaneous calls across the SIP trunk that passes over
the smaller line, and permit 10 simultaneous calls across the larger
link?
I also wish to have priorities, so that more important calls are sent
over the smaller link (but more reliable) and the larger link used for
less important calls.
Can you do this priority based on the user ID of the caller?

Another question:
If a user with a SIP client starts off in remote office1, and then
moves to remote office4, can then keep the same phone number?

Kind Regards

James