Strange Behaviour: Make Call -> Hold

[vitaminc]

I've done an installation today with several yealink phones.
3CX phone on windows 7.
CTI mode activated.
Doing a call from the Softphone with a W52H.
W52H says "Make Call" which i accept.
Then it's automatically on HOLD and i hear our own queue music while the remote phone (which is my mobile phone in the test) is ringing. If i answer the request on my mobile phone, the W52H is still on HOLD.

Another one:
I call some hotline where you have to put some number to get forward to a service, i choose 3 as example, it's ringing, if someone answer the phone the W52H is getting on HOLD and i can listen to our own queue music again.

What the hell?

thx
sascha

 

[NickD_3CX]

If you are using a VoIP Provider to call out, go to the "Advanced" tab of the VoIP Provider settings in the Management Console and make sure the "Supports Re-Invite" and "Support 'Replaces' header" are both disabled and that "PBX Delivers Audio" is enabled.