[asterisk-users] Asterisk/DAHDI with "Dynamic T1s"

[Kevin P. Fleming]

On 09/29/2011 12:22 PM, Tim Nelson wrote:
> Greetings-
>
>  From time to time, I find myself working with (or customers working with) "dynamic T1s". They are typically standard T1s that terminate to an Adtran device which utilizes the channels for data (64kbps X 24) until a call is pushed inbound/outbound on the circuit. One data channel is automatically peeled off the circuit (removing 64kbps from total data throughput capacity), and reallocated as a voice channel.
>
> Is it possible for Asterisk/DAHDI to handle a situation such as this? If I recall, DAHDI does have some data functions to it, but I'm not sure if it can handle the circuit as data (presented to kernel for iptables routing/nat), and/or if it can automagically reallocate channels for voice usage on the fly.

There are methods of peeling off channels dynamically to be used as data 
channels (PPP/RAS style), but not the other way around to my knowledge. 
Once an HDLC network link has been setup in the kernel's HDLC layer, I 
don't believe it can be shrunk or grown.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
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