- Is it planned that the VoIP phones operate in a stand alone manner (e.g. dialing each other by IP address)
- Are these VoIP phones for remote workers?
- Do you need these VoIP phones to be reachable from an existing phone system (PBX)?
If the VoIP phones you select are based on open standards, your existing network infrastructure may be sufficient.
Each VoIP call using compressed voice (G.729) requires about 24 Kbps upstream and downstream. If this 1Mb/s connection is dedicated for this VoIP application, that is sufficient. If this 1Mbps connection is shared as a connection to the Internet some additional equipment may be required to ensure good voice quality.
A good idea would be to contact a reseller of VoIP equipment for help and advice.
This was first published in October 2005