SRST with fractional ISDN CUCMBE 6

[richard.jackson]

Hi,

I am carrying out an install with CallManager 6 Business edition and run into a hurdle.

As the customer only has 15 Channels on the ISDN30 E1, I have shut down the channels using the maintenance option in the advance tab of the system parameters; this works fine when the gateway is in MGCP mode. The problem I have is when the gateway falls into SRST mode, as it attempts to put the outbound call out on channel 30 and therefore the call fails. Does anyone know of a fix for this.

[vmoopeung]

MGCP fractional T1 is not fully support in Cisco callmanager , better try changing to H.323 gateway for fractional T1.

[gogasca · Accepted solution]

Use under the ISDN interface the

"isdn b-channel ascending" command