Ho do I override the default contact extension s?

[jps]

Hi!

I hope you can help me.
How do I override the default contact extension s?

I used the following in users.conf to register with my sip VSP:

[trunk_1]
secret = mysecret
provider = sipgate_de
trunkstyle = voip
username = 1234567
trunkname = Sipgate.de - 1234567
callerid =
hasexten = no
hassip = yes
hasiax = no
registeriax = no
registersip = yes
host = sipgate.de
dialformat = ${EXTEN:1}
context = sipgatein
group =
insecure = very
fromuser = 1234567
fromdomain = sipgate.de
nat = no

Incoming and outgoing calls work flawless.

In extensions.conf i use something like

exten => s,1,Dial(SIP/210,25,Ttr)

to forward the call to a phone with the number 210.

So… no problem until here. But unfortunately i register my Asterisk with several VSP and I don’t want that every incoming call will be forwarded to the same phone.

I know that I can use the following in sip.conf:

register => 2345:password@mysipprovider.com/1234

to register with an own contact extension (/1234).

Is there a way to do something like that in the context of trunk_1 in users.conf ?

Thank you in advance

Patrick