Choosing a VoIP Phone
With so are many VoIP phones available on the market today, it’s difficult to narrow down the choices and select which VoIP phone to get. The trick to buying the right VoIP phone is to get to know the VoIP protocols supported by the phone; that way, you can see if that particular phone will fit your needs.
These VoIP control protocols may include:
Session Initial Protocol (SIP) is a standard multimedia with conference protocol that makes up voice, video and data conferencing through packet-switched networks.
Media Gateway Control Protocol (MGCP) is an internal protocol used within one VoIP system, and is designed to address the demands of carrier based phone networks.
IAX2, which has more bandwidth sufficiency that other VoIP protocols, allowing you to support more VoIP calls at the same time using the same amount of bandwidth.
Other features that might be useful:
3-way calling
Do Not Disturb mode
Custom ringtones
A feature that allows you to work behind routers and Network Address Transaction
Real Time Transport Protocol Support
Support for a SIP outbound proxy
Compliance with Quality of Standards
Encryption
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