We are currently on a ISDN2 Line, but we want to switch to ISDN30 or SIP Trunking.
What kind of hardware do we need to purchase for our Cisco 3825 Router for ISDN30 or SIP Trunking? I'm thinking of a PRI card for the ISDN30, but I don't know which one and also if I need any hardware for SIP Trunking.
We currenly have 3 VIC2-2BRI-NT/TE cards, but I don't think that will work for ISDN30 because of the 2 B Channels.
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...