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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20040911/aa7b1598/attachment.htm
Help!!!!!DEAN RENU
LET ME KNOW ONCE YOUR GSM INTERFACE IS DONE, WE WILL BE INTERESTED TO BUY THESE
THANKS AND KIND REGARDS
ANDY SINGH
+1 416 856 7047
----- Original Message -----
From: Renu Rangnekar
To: asterisk-users@lists.digium.com
Sent: Saturday, September 11, 2004 2:40 PM
Subject: [Asterisk-Users] Help!!!!!
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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On Sun, 12 Sep 2004 00:10:51 +0530, Renu Rangnekar <rrenu@cedt.iisc.ernet.in> wrote:> 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.What you need is a single channel GSM gateway, like this one ... http://www.mobilecomms-technology.com/contractors/gsm/eurotech1/eurotech11.html which allows you to do something like: [Asterisk]<=>[single FXO]------[GSM-GW]<=>(GSM network) or if you have a need for many more channels, there is this one ... http://www.mobilecomms-technology.com/contractors/gsm/eurotech1/eurotech14.html which would be used in the following way: [Asterisk]<=>[T1/E1]------[GSM-GW]<=>(GSM network) this one not only supports multiple channels but it also has the ability to use any of up to 4 SIM cards per channel. This means if there is an outgoing call from your Asterisk system to a particular GSM network, you can let the gateway automatically use a SIM card of that network in order to get the lowest tariff. As far as the GSM network is concerned, the gateway looks like one or more ordinary mobile phones. There are several other products in these categories. The cheapest I have seen was about 150 USD (IIRC) for a single channel GSM to FXO gateway. rgds benjk -- Sunrise Telephone Systems, 9F Shibuya Daikyo Bldg., 1-13-5 Shibuya, Tokyo, Japan. NB: Spam filters in place. Messages unrelated to the * mailing lists may get trashed.