The following system features depend on certain phone compatibility.
| Feature | Polycom VVX | Polycom SPIP | Yealink | Grandstream | Snom | Cisco | Cisco (SPA) |
|---|---|---|---|---|---|---|---|
| Calling | |||||||
| Register to SIP Domain (SRV) | Works | Works | Works | ||||
| Make a Call | Works | Works | Works | ||||
| Receive a Call | Works | Works | Works | ||||
| Hold | |||||||
| Place a call on Hold | Works | Works | Works | ||||
| Music on Hold (MoH) | Works | Works | Works | ||||
| Transfer | |||||||
| Blind Transfer | Works | Works | Works | ||||
| Attended Transfer | Works | Works | Works | ||||
| Lights | |||||||
| Busy Lamp Field (BLF) | Works | Works | Works | ||||
| Bridged Line Appearance (BLA) | Works | Works | |||||
| Shared Line Pickup | Works | Works | |||||
Message Waiting Indicator (MWI) | Works | Works | Works | ||||
| Voice Mail Retrieve | Works | Works | Works | ||||
| Call Pickup | |||||||
| Directed Call Pickup | Works | Works | Works | ||||
| Group Call Pickup | Works | Works | Works | ||||
| Miscellaneous | |||||||
| Auto Provision | Works | Works | |||||
| Intercom | Works | Works | Works | ||||
| Paging | Works | Works | Works | ||||
| Phonebook | Works | Works | Works |