Does anyone have a suggestion on an on-premise or hosted PBX with good CTI functionality for SFDC Call Center? We are looking at Cisco and Avaya for on-premise and Five9, M5, RingCentral for hosted. Any others? Need about 40 seats, but also need call recording, ACD metrics, etc. Need good, stable functionality with reasonable upfront and monthly costs. We have an existing Nortel Meridian Option11.  Will that work with an integration?  Any suggestions appreciated! 

Does anyone have a suggestion on an on-premise or hosted PBX with good CTI functionality for SFDC Call Center? We are looking at Cisco and Avaya for on-premise and Five9, M5, RingCentral for hosted. Any others? Need about 40 seats, but also need call recording, ACD metrics, etc. Need good, stable functionality with reasonable upfront and monthly costs. We have an existing Nortel Meridian Option11.  Will that work with an integration?  Any suggestions appreciated!