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IP Telephone

Posted on 2013-05-23
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Last Modified: 2013-05-28
I'm wanting to do something I see as simple but not sure how so go easy on me.  I have a Cisco 2811 router with a 2 port FXO card installed.  The IOS is 12.4(13r) and the image file is advipservicesk9.  I have an analog line that I want to ring a Cisco VoIP phone that is configured with the directory number 3910.  Any help would be appreciated.
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Question by:hackman122
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4 Comments
 
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Expert Comment

by:unfragmented
ID: 39193077
Let me break this down into usable sections:-

1. Hardware.
Ensure you also have PVDM (DSP) resources, otherwise your FXO will not be usable (see this at the CLI with a show ver).

2. IP Telephony
Configure your basic telephony.  Google this - there are bucketloads of minimal configs on the web.

3. Configure dial-peers for external connectivity.
Google this as well.  Best to build these to suit the area you are in.

4. Configure voice interfaces - generally want to use PLAR for an FXO.
voice-port x/x/x
connection plar 3910

That should give you a good high-level start.
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Author Comment

by:hackman122
ID: 39194764
I don't seem to have a PVDM installed so that would explain it.  Not being a VoIP guy I wasn't sure if one was needed when using an FXO card.  What would be the minimum PVDM needed to run the scenario I need?
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unfragmented earned 2000 total points
ID: 39196181
a pvdm2-8 (smallest) will probably sort you out for fxo channels.  General rule is that the number on the end describes how many medium complexity (g.711) channels it can code/decode.  High complexity (g.729 etc) channels require double the resources.  There are two slots in the 2811 and they are additive, so I would get what you need for now and upgrade later if you need.  If you want to get specific, check the cisco dsp calculator tool online at http://www.cisco.com/web/applicat/dsprecal/dsp_calc.html
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Author Closing Comment

by:hackman122
ID: 39202634
Thanks.  I appreciate the information.  I'm looking at a PVDM-48 which should get me what I need for now and a possible fractional PRI in the future, which will of course make using the fxo port irrelevant.  Go figure.
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