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Components Needed to Set-up an Internal Cisco VoIP Network


I have the following hardware:

1 x Cisco 2821 ISR router
1 x Cisco c3750g T24
3 x Cisco 7941G IP Phones

I only need to make internal calls with the Cisco IP phones:

- what Interfaces/other components do I need?
- What software do I need (and more importantly, will I have to pay for it)?
- Are there any step-by-step guides to configure this?
2 Solutions
You will need to set up CUCM, there is a free version -
greg wardCommented:
The 2821 supports voice so you dont need to set up a virtual machine and install CUCM although its an easy option its only half the picture.
¿Analog and digital voice call support
¿Dedicated Extension Voice Module slot
¿Optional voice mail support
¿Optional support for Cisco CallManager Express (Cisco CME) for local call processing in stand alone business for up to48 IP Phones
¿Optional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 48 IP phones

You would need an ios that supports voip and cme software this is possible to download from cisco but does require a smartnet contract.
You can also get a cue module or network module for voicemail.
Also an FXO module to connect to the PSTN this would require a pvdm module inside the router.
You can set up the router to support sip clients and connect to sip gateways.
There is plenty of documentation around the web to configure all of the above. A lot of it is on the cisco website.

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