20 Analog Trunks on CME 2911

[ksantillan06]

Hi guys.

We have a current requirement that has the following specifications.

Minimum of 20 Analog trunks, 1 x E1 PRI ISDN trunk, with SIP license (60 licenses), with IVR, call data recording

I have configured a 2911 with the appropriate licenses in CCW. But, how can I come up with a solution for 20 analog trunks? I am not yet familiar with this.

Thanks in advance.

[Nadeem Ahmed]

Analog trunk circuits connect automated systems, such as a private       branch exchange (PBX) and the network such as a central office (CO). The most       common form of analog trunking is the E&M interface. E&M Signaling is       commonly referred to as "ear & mouth" or "recEive and transMit", but its       origin comes from the term earth and magnet. Earth represents electrical ground       and magnet represents the electromagnet used to generate tone.

E&M signaling defines a trunk circuit side and a signaling unit       side for each connection similar to the data circuit-terminating equipment       (DCE) and data terminal equipment (DTE) reference type. Usually the PBX is the       trunk circuit side and the Telco, CO, channel-bank, or Cisco voice enabled       platform is the signaling unit side.

Here is the link for analog trunk

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080093f60.shtml

Br,
Nadeem 

Please rate all useful post.

[ksantillan06]

Thanks for the reply Nadeem.

So what module option can you suggest so I can enable 20 analog trunks for the 2911?

[Hermanus Janse van Vuuren · Accepted solution]

EVM-HD-8FXS/DID                               High density voice/fax extension module -8 FXS/DID

EVM-HD-8FXS/DID

The Cisco High-Density Extension Module for voice and fax

has 8 FXS and DID ports. Individual ports on the basebo

ard

module can be configured for FXS or DID signaling. Adj

acent ports should share the same configuration to avoid i

mpedance

setting conflicts. A change to the impedance setting for o

ne port, changes the setting on the adjacent port. Pair

ed ports are: 0

and 1; 2 and 3; 4 and 5; 6 and 7.

An on-premises FXS interface connects directly to a standar

d telephone, fax machine, or similar device and supplies

ring,

voltage, and dial tone. Signaling support available in

FXS mode includes loop-start and ground-start. DID tru

nks from the

central office can be connected to the Cisco High-Density E

xtension Module baseboard for off-premises connections.

Signaling support available in DID mode includes immedi

ate, delay dial, and wink start.

Users plug in up to two expansion modules in any combina

tion to increase the voice and fax capacity of the Cisco Hi

gh-

Density Extension Module baseboard.

or

EM3-HDA-8FXS/DID                             8-port voice/fax expansion module-FXS/DID

EM3-HDA-8FXS/DID

This 8-port FXS/DID Voice and Fax Expansion Module pro

vides on-premises FXS signaling to connect directly to a sta

ndard

telephone, fax machine, or similar device and supplies ri

ng, voltage, and dial tone. Signaling support availabl

e in FXS mode

includes loop-start and ground-start. This expansion modu

le also works with the Cisco High-Density Analog Voice an

d Fax

Network Module (part number NM-HDA-4FXS).

DID trunks from the central office can be connected to t

he Cisco Voice and Fax Expansion Module for off-premises

connections. Signaling support available in DID mode incl

udes immediate, delay dial, and wink start. It support

s up to eight

ports in DID mode, both expansion slots combined (with ei

ght DIDs on EVM baseboard, up to 16 DIDs maximum).

Additionally, it supports robust front end protection.

[ksantillan06]

Hi Hermanus.

Thanks for the response. Just to clarify, any of the modules you have mentioned can support 20 analog trunks? Correct?

[Hermanus Janse van Vuuren · Accepted solution]

Both modules are 8 ports each, you will need more or less 3 of them per router whick = 24 ports.

[Nadeem Ahmed]

What is the far end with which you are making Analog trunk ? You would need to check with far end what kind of analog trunk they want and according to that you would get the appropriate module..

Br,
Nadeem 

Please rate all useful post.

[ksantillan06]

Thanks for the response Nadeem. Can you please inform me what are the possible types of "far end" of the analog trunk that is possible? So I can ask our client the proper questions.

Thanks in advance.