I am trying to transfer calls using three new Cisco IP phones. I have one Cisco SPA508G and two Linksys SPA942. I am subscribed to a hosted PBX using voip.ms. The phones are configured using SIP.
Attended Transfer (Fails): I receive an inbound call from a customer. The call is answered. I hit xfer and dial either an internal extension or outside number. Once the call is answered I hit xfer again. The call leaves the middle phone and it appears the call was transfered but no sound on either side.
Blind Transfer (Works): I receive an inbound call from a customer. The call is answered. I hit bxfer and enter the internal extension or outside number. I hit dial. The two callers are connected and can hear each other.
I can use both phone models to do a conference call.
It does not matter if it's an outside call or internal extension. bxfer works and xfer does not.
I have updated the firmware to the latest on both which is: SPA508G is 7.4.7 and SPA942 is 5.2.8.
I have tried a factory reset on the phones. I have tried changing every setting I can think of. I spoke with voip.ms and they have already enabled the xfer feature.
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