Voice cards with failover functionality

[a.gooding]

Here is the scenario,

customer has T1-CAS and 18 Analog lines. these lines will be used for private lines but they also want these lines to provide PSTN connecctivity in cases of power failure.

im familiar with the cards that has the failover capability but offers only two lines and then we need an analog phone connected to the router.

What solutions are there for PSTN connectivity with complete power failure for an organisation with FULL IPT.

[sbilgi]

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

This URL should help yoy:

http://www.cisco.com/en/US/products/hw/routers/ps259/products_qanda_item0900aecd8017014a.shtml

[a.gooding]

Yup,

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.