[Asterisk-Users] Partial PRI pass thru?

[Kevin P. Fleming]

Matt Burleigh wrote:

> The legacy phone system would only be able to use, for example, channels
> 16-23 from the ISDN PRI coming out of the * server. 

You cannot make it invisible, because the D-channel cannot be shared.

However, PRI channels are allocated dynamically, so doing what you want 
to do is trivial using channel group assignments and count checking 
before initiating a dial operation in either direction. Just a matter of 
defining the logic and writing some dialplan magic to do it :-) The 
trick is understanding that the limitation is not a specific group of 
channels, but a maximum number of simultaneous channels in use.