[Asterisk-Users] Limiting call minutes on a GSM SIM

[Remco Barende]

Hi!

I'm considering to buy a GSM bridge to save on GSM calls. Right now they 
are offering subscriptions with 200 minutes each month for almost nothing, 
however the 400 minutes subscriptions are considerably more expensive.

Most GSM bridges can cater for 2 SIM cards, is there a way for Asterisk to 
run the first SIM card to it's max and then switch to the second? (If one 
call would overlap I wouldn't mind).

Asterisk would have to keep track of the minutes called each month for a 
SIM (channel?). On most bridges you can select the SIM you want by a dial 
prefix.

Thanx!