Compatibility with old machine (dial tone checking)

[dmonnerville]

Hi everybody,

i’d like to use GL series GSM modem instead of classic analog modem for M2M reporting with old Motorola radio basestation.

This systems always perform a dial tone checking by sending “atdt” command (without phone number), plus this sequence cannot be configured.
with classic modems , the answer “BUSY” is send, but the GL modem always answer “ERROR”. as a consequence, the basestation considers that it cannot do outgoing data calls.

Is it possible to configure the gsm modem to make it answer “BUSY”?

[awneil]

@dmonnerville

This systems always perform a dial tone checking by sending “atdt” command (without phone number), plus this sequence cannot be configured.
with classic modems , the answer “BUSY” is send

That sounds highly dodgy to me - I don’t think it is a reliable, modem-independent indication of dial tone

but the GL modem always answer “ERROR”

I think that would be perfectly correct behaviour.

Is it possible to configure the gsm modem to make it answer “BUSY”?

Not “configure” it - but you could have an Open-AT application to intercept the command and give the response you require…?