Please explain the Cisco TelePresence ISDN GW's use of the Send calling number option with Deutsche Telekom circuits
Some ISDN switches set restrictions on the number of digits in the E.164 number and this is configurable by the PRI provider. At some customer sites we have found that when this option is set and the number of digits being sent by the Cisco TelePresence ISDN GW is not the same as the number configured by the PRI provider, the call can be dropped or “0” is sent instead of the correct E.164 number.
Then, if your PRI has been configured by your provider, for example Deutsche Telekom, for a 2-number extension (0-99) and you try to dial with a 3-digit extension, or extension numbers not in the range allowed, the PRI may not allow you to place any outgoing calls.
This article applies to the following products:
- Cisco TelePresence ISDN GW 3200 and 3241 / MSE 8310 and 8321 ISDN blades