There are many many "voip" solutions out there, and no general one unfrotunately. You should start by reading the design guides and then maybe post something more intuitive when you find out the requirements of the company.
Toll Bypass, Call Manager solution, IP telephony for branch offices, Transparent signalling between PBX's, and many more.
Ok, here are some details as to what I would be looking to do. We have a main office with 6 remote offices of 5 - 20 users each and growing. I am looking to basically consolidate all the offices onto 1 maintainable system. We currently have T1 access with frame relay connecting the offices.
It narrows them down, however there are still a ton of ways to impliment. If you want total failover redundancy you would look at more hardware costs. If you want to do something similar to what I have done I have basically a single point of failure for an "Inteligent" system that if the lines get cut from my main site all of the other sites work, however they work of off something called SRST. However depending on if you have your voice mail at the main location or at a different one that could also be effected.
I would suggest looking up some information, look at your buisness needs, and then talk to a consulting group (a few of them) to see how they would impliment, mentor, save money, and of course keep the administrative overhead to as a minimal as possible.
Due to the bandwidth requirements to keep the Quality of Service of voice traffic so that it is either 100% perfect, or has a "Cell Phone" quality data networks are impacted. This consideration needs to also be taken. If you have a site or certain things that can not be impacted, and it overrides your voice quality you will have some nice complaints. This should be something the outside vendor also should be taking into consideration.
The long and the short end of the answer - If someone is asking you to impliment this and you have no prior experience get help. If you are just researching it, continue, there are pleanty of articles out there on this system by cisco.
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If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
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