Hi
We wish to implement VoIP to (primarily) communicate with our overseas office, but at the same time reduce the phone bill for the office in general.
We have a 1 MB leased line connecting to a Cisco 2501 router (ISP managed), then a Cisco PIX 506e, through to four 3COM 4288g manageable network switches.
The remote side will be implementing Cisco Express.
A couple of questions -
i) Is it recommended we implement Cisco Express too, for compatibility issues, or can we use any system (e.g. Avaya). ii) We will outsource the implementation to external companies, but wish to manage the maintenance. Given that none of the of the IT department has experience in either Cisco Express or Avaya etc, what is the most straighforward application to learn. iii) One method of implementation is to insert a VoIP card into our existing Samsung phone switch and use QoS on our existing infrastructure. Another would be to leave the existing infrastructure for data only and use a SIP gateway and seperate ADSL line for voice (which one company is advising). Any thoughts? Their claim is that QoS can only go so far, and a seperate ADSL line/dedicated hardware is what is needed.
Would be grateful for pointers.
Cheers