This article relates to the Cisco TelePresence ISDN GW 3241 and Cisco TelePresence ISDN GW MSE 8321 products.
Q. Does the Codian ISDN GW support downspeeding?
A. Yes, if a channel (other than the primary channel) is dropped, the call should be renegotiated at a lower bit rate using less BRIs. If the primary channel drops, then the call will fail.
For downspeeding to work:
Note: A number of interoperability issues may occur between the Codian ISDN GW and an endpoint while downspeeding. Contact the technical support team to check if the Codian ISDN GW supports downspeeding with your endpoint.