Asterisk setup for SIP to GSM cell phone

Hi,
I got it to work with the following. However as this is a primitive set-up, I was only able to dial from cell to SIP and not the other way round. I also had to configure my BTS to support full rate CODEC only, otherwise the signalling worked but there was no voice traffic. I believe this is due to a CODEC licensing issue on Asterisk?

A typical SIP entry (extensions.conf) will look like...

    [test]
    exten=123453000,1,Log(NOTICE, Incoming call from ${CALLERID(all)})
    exten=123453000,n,Dial(SIP/123453000) 

A typical SIP entry (sip.conf) will look like...

    [123453000]
    type=friend
    host=dynamic
    canreinvite=no
    username=123453000
    secret=MySecretCode
    nat=yes
    qualify=yes
    mailbox=1000
    context=test
    disallow=all
    allow=gsm
    allow=ulaw
    allow=alaw
    allow=ilbc 

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