Phones must be SIP (session initiated protocol) capable to work with Vonage Busines service. 

• Prior to troubleshooting a service issue, ensure that your phones are updated to the newest recommended firmware version.
• Compatibility, functionality, or connectivity of phones not purchased through Vonage cannot be guaranteed.
• Devices locked by your previous provider can only be unlocked by them. 
• Best-effort support for hardware not listed here is provided. 

Phones that have been extensively tested and are known to work well with Vonage service include the following:

NOTE: Each release is tested to ensure continued compatibility for supported models.

Panasonic

Panasonic Phone Setup

Model	Firmware Version	Busy Lamp Field	Shared Line Appearance
TGP600AL User Guide	TGP600TPA6x-US-06.001	No	No
TPA60/65/68 User Guide	TGP600TPA6x-US-06.001	No	No

Polycom

Model	Firmware Version	Busy Lamp Field	Shared Line Appearance
VVX250 User Guide	5.9.6.3057	Yes	Yes
VVX350 User Guide	5.9.6.3057	Yes	Yes
VVX450 User Guide	5.9.6.3057	Yes	Yes
RealPresence Trio 8500 User Guide ​​​​​​ ​	5.9.1.10906	No	Yes
RealPresence Trio 8800 User Guide ​​​​​​ ​	5.9.1.10906	No	Yes
E100 User Guide	8.0.0.2473	Yes	Yes
E220 User Guide	8.0.0.2473	Yes	Yes
E320 User Guide	8.0.0.2473	Yes	Yes
E350 User Guide	8.0.0.2473	Yes	Yes
E450 User Guide	8.0.0.2473	Yes	Yes
E550 User Guide	8.0.0.2473	Yes	Yes