I am currently defining the architecture for a very simple VoIP network that is to be installed in a small office (about 70 VoIP extensions). Initially, we don't want to include any special feature, just the internal voice IP service and the ability to make up to 4 simultaneous external phone calls through PSTN.
We are going to acquire a Cisco 2921 Router, the SL-29-UC-K9 Unified Communications licence and a VIC2-4FXO.
I have been reading about ISR G2 licensing, but I am still not sure of fully understanding what we need for this project. My question is, does the UC licence for the Cisco 2921 include the FL-CME licence to use the Call Manager Express functionality? do we need something else? any special license for the FXOs functionality?
Actually, it's my first contact as a developer with VoIP and UC Cisco technology... so I would like to keep it simple at the beginning: just internal voip phone calls and the possibility to ring pstn extensions. Our budget is very limited too... so I need to stick to the hardware that I told you in the previous message: 2921 + fxo card.
As far as I have read, SRST functionality is very useful when you have several nodes, to provide survival to each local node that loses connectivity with a centralized call manager. But in our scenario, with a single node... I think we can give up this functionality.
So, we only have budget to purchase any other license that could be necessary to accomplish this small project. so the key question is: does SL-29-UC-K9 Unified Communications License include Call Manager Express functionality and the ability to use de FXO card to make pstn phone calls as well? because that will be more than enough for us...
Simple and small VoIP network ? You may consider SMB line of Cisco products. Something like SPA5xx or SPA3xx phone in SIP mode as end user phone. Any SIP PBX. You are not limited to Cisco product, there are so many solutions based on Asterisk software. Some of them have PSTN interface cards inside already, or you can use third party gateways. Either Cisco's or something like Berobox.
Advantages: cheap, but still very reliable solution, flexible in features, it's possible to maintain high level of security, scalable from few lines to few hundreds lines. Once you designed first network, you can reuse the solution design easily.
Disadvantages: it require skilled architect (you) to design reliable network, Cisco support for SMB segment devices is poor.
I designed several VoIP network based on SPA504G and cheap generic PC with Asterisk software (running on configuration I designed). The smallest network have about 20 users, the largest have few thousands users in 7 countries ...
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