[Serusers] Register one phone at multiple registrars

[Ulrich Holeschak]

Hello,
it is possible with ser to register with one phone at multiple registrars?
In the phone i could enter only one registrar, so i would like that ser
"forks" this registration request also to other registrars at the same time?
Is this possible? Can i simply rewrite the URI of the registration request
or is a special handling required?

Thanks,

Ulrich