Perhaps it is an incompatibility issue between the SX20 and the Radvision and not anything to do with the ISDN link.
I know there are some issues with the codec negotiations with some of the older versions of firmware on the SX20... which firmware version are you running? I'd recommend that you upgrade to TC6.2.1 if possible as this has resolved a number of these types of issues for us.
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Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...