Hi,
I am experimenting with VOIP with following goal:
Build cost effective and reliable VOIP solution for a company with two branch offices (US and UK) with about 10 staffs each office.
Other general requirement
1. For each sites 4 local PSTN lines are available to connect to the VOIP system
2. Each sites need about 12 extensions (8 VOIP/SIP phone and 4 analog phones as extensions)
3. Provide voice mail functionality for all extensions.
4. Site 1 extension starts with 100 and site 2 extensions starts with 200
5. Users from either site should be able to dial local numbers from either locations using the PSTN lines
Eg. dialed numbers starting with 9 should dial out through one of 4 PSTN lines connected to US office system
dialed numbers starting with 8 should dial out through one of 4 PSTN lines connected to UK office system
6. Allow to connect to third party VOIP carrier to call any other countries (eg. numbers starting with 7 indicating to use the VOIP carrier to dial out)
Please suggest how can I build solution for this.
Can we use:
1. Cisco SPA9000 as central IP PBX in data center located in US.
2. Cisco SPA400 in each site as PSTN termination - 4 lines; which supports 16 voice mails
2. Cisco SPA8800 in each site as telephony gateway to provide 4 analog extension lines
