How are your switches configured ("switchport voice vlan" or manually configured dot1q trunks)? Are all of the effected phones on a particular switch? Why do you need an IP Helper command?
What you describe can be caused by VLAN leakage, when misconfigured Native VLANs cause traffic from one VLAN to seep into another VLAN. It can also be caused by IP Helper commands, so I'm courious how those fit into all of this.
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...