Hi Simon,
There are a lot of things that you need to be aware of before you request for a product/solution recommendation:
>> How many IP phones would be registered with the server ( CUCM ) ? If it is just a couple of hundred and is a single site solution then you may go for a BE6000 solution or a high end CME router. If this is a solution with a few hundred phones/users then you need to look at a full fledged CUCM solution ( specs based or BE6000M/H ) so that you have options of redundancy/failover , scalability etc.
>> Check if you are using a Contact center based solution ( like UCCX or any other third party solution )
>> Check if you will have Video calling capabilities ( need to choose IP phones / softphones accordingly ) and also allocate the bandwidth accordingly
>> Check if you will require audio and video conferencing and if you have the required DSP's or a Video conferencing solution like Cisco Meeting Server ( CMS )
>> It would be good if you check the Deployment Models available at the following link to get an insight on how to choose the correct deployment model
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab11/collab11/models.html
Once you have a good idea you should ideally sync up with your local Cisco SE or partner and ask for recommendations regarding the solution, pricing and related stuff.
HTH
Manish
