I still remember the days when we used to be head-on with BSNL/MTNL guys. Most of the time, its a provider issue and got solved only after taking with them to a considerably higher level and after a long dispute.
ISDN-BRI in India is the most untrusted Data Network.
Best would be if possible change the provider i.e. Reliance or Bharti. But sometimes if the option is not available, as Prem said, get as many logs as possible and talk to a senior person at the Exchange who can be of some help.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...