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Re: (voice modem) + caller ID
On Tue, 11 Jan 2000, Gavrie Philipson wrote:
> Shaul Karl wrote:
> Well, mgetty and vgetty only work with Class 2 modems. This is by
> design.
>
> Class 1 modems try to implement all the low-level protocols in software.
> This is basically a real-time operation. A multitasking OS such as Linux
> is by definition not real time (without special extensions), so a Class
> 1 implementation will raise the CPU load to pretty high levels. This is
> basically the same concept as Winmodems vs. real ones.
> Try to get a Class 2 modem -- they're not that expensive, although they
> may be hard to get by these days. Vgetty works like a charm with these
> modems. I find it hard to believe you'll find software that works with
> Class 1 modems on Unix/Linux.
>
> BTW -- if it's an option for you, get an ISDN line and card. ISDN cards
> can do voice, and have crystal-clear quality. Linux supports voice with
> ISDN cards, but you'll have to check which cards are supported.
>
> Gavrie.
Thanks for the reply. ISDN is not an option in my case, and I may consider
switching to class 2 modem. In any case, is there any good implementation
just for using caller ID feature on class 1 modems and counting number of
rings, passing this info to a script... I've tried to code something like
this myself but it had lots of trouble.
My modem uses the AT+VCID=1 command set with replies like:
DATE=1101
TIME=0923
NBMR=035551212
Thanks,
Alon
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