Hey,
New to VoIP and had a couple questions of GSM gateways and setup.
The basic scenario is this:
GSM Device (cell phone) <--->
* GSM Gateway (SIM chip from another cell phone) <--->
Asterisk <--->
Outside world
Basically I want to dial into my asterisk box over a GSM connection,
capture DTMF signals, using those call out to the provided number. As
a security overlay I want a minimum of capturing the caller ID of the
originating cell phone (preferablly having a cell phone with settable
caller ID).
Obviously the data flows both ways on a call, but from what I've read
initiating a GSM call from the base station isn't the same as
receiving one. I'd like to go both ways but initiating is of less
importance as alternate channels (email, jabber, etc.) are available
to notify of a call if absolutely necessary.
I've been googling around for GSM gateway options and not getting very
far. There seems to be three ways to go so far:
1. Two cell phones, the one at the base station with a bluetooth
connection to the asterisk
server.
2.Two cell phones, a specialised craddle for the model of phone used
to connect.
3. GSM gateway appliance.
The first and third option stand out as I'd prefer not be reliant on a
cell phone model.
Questions:
Is option 1. even feasible? Is there a standard data schema for
incoming call data such as caller ID, incoming/outgoing voice data,
etc.?
Are there realistically priced home user variants of option 3? Most
I've seen so far are rack mounted 16-32 channel switching stations. If
so does anyone have experience with any or suggested
manufacturers/models?
Are there cell phone model/provider/SIM chip differences I'm going
to encounter (obviously the models must have bluetooth for option 1 to
work)?
Are there questions I don't even realise I should be asking?
Basically any assistance in even pointing to the right resources would
be greatly appreciated.
P.S. I program professionaly so I'm not too worried about asterisk
side of things... or should I be? Heh.
