The FXO Power Failure feature is a hardware feature built into the FXO cards that allows connectivity to an analog phone patched into the right pair of wires to be activated by a relay if power to the Cisco router containing the NM-HDA fails. This allows PSTN calls to be made via the FXO line normally connected to the router from a designated "red" phone in the office while power is out. For an FXO EM in slot 0 of the NM-HDA, the analog phone must be connected to wire-pair 14 (counting from 1 on the RJ-21 connector) to take advantage of the FXO Power Failover feature. For an FXO EM in slot 1 of the NM-HDA, the analog phone must be connected to wire-pair 24 (counting from 1 on the RJ-21 connector) to take advantage of the FXO Power Failover feature. If both EMs are populated with FXO modules, two "red" phones can be used.
The following combinations are supported:
? 4 FXS: base NM only
? 12 FXS: 4 FXS on the base NM, one 8-port FXS EM
? 4 FXS + 4 FXO: 4 FXS on the base NM, one 4-port FXO EM
? 4 FXS + 8 FXO: 4 FXS on the base NM, two 4-port FXO EMs
? 12 FXS + 4 FXO: 4 FXS on the base NM, one 8-port FXS EM; one 4-port FXO EM
know this and this is what i submitted to the customer. however, the customer wanted this type of solution, on a larger scale, meaning, instead of two phones, 18 analog phones placed in specific areas to ensure that call functionality is still maintained.
i think its a valid request, and other than running 18 analog phone lines with splitters to all the locations and taking the ringer off, i see no other "failover" method presently, for this type of request.
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...