[Asterisk-Users] Help!!!!!

[Renu Rangnekar]

Hello all,

I am an MTech student and currently working on a project on building GSM air interface to fixed line. I am making use of Asterisk soft PBX. I am stuck at a point regarding this.  As far as I understood from the available Asterisk documentation that Asterisk can easily plug into it the various programming interfaces and different codecs in it can seemlessly talk to one another. Asterisk has a codec translator API for GSM. Is it possible to make Asterisk directly communicate with a GSM air interface module thourgh the GSM codec API ? That means that i would be making a call from IP phone that wil be routed through the asterisk to the GSM interface. If it is possible, where should i make the necessay changes to enable this interworking.
Can i make asterisk to work as a softphone by itself and with the help of sound card can i route the call to a GSM circuit. Basically i want to connect the incoming landline call to a GSM circuit through a PBX.
Is it feasible to connect the output of the sound card to the Acoustic interface(microphone interface) of the GSM circuit?
Further can i include an executable script file (containing AT commands to the GSM modem) in the Asterisk dialplan? Basically i a running two SIP clients. One SIP client makes a call to another which is running on the Asterisk machine itself. Asterisk will route call to the SIP user agent which will then make use of sound card. If i mmeanwhile modify Asterisk dialplan to issue AT commands to GSM modem. The analog baseband of GSM chipset will take its input from the sound card and will then make a radio link to the dialed cell number.

Thanks a lot in advance for help!!!
Renu Rangnekar
MTech Student
IISc,Bangalore 

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