Call Transfer issue

[Brock_4118]

Hello All,
I am facing problem with one extension that when it tries to transfer the call that persons call gets on hold whom we want transfer,
now i dont know if its problem with 3CX or with my Ip phone , i am using Yealink t21e2 model & i have reconfigured the extension also did upgrade the firmware
but still no luck.
Anyone can guide me with this ?

Thanks.

 

[JohnS_3CX]

Hi Brock,

Please provide some more information so we can help https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

 

[Brock_4118]

Hi Johan,
Below are the details,

3CX version : 15.5.5
Server OS : Windows server 2012 R2
Phone : Yealink T21 E2
Provisioning Method : STUN
Trunk : springcom
Firewall : Yes
Template : No

We are using 3CX in all our branches & some times some phones do get transfer problem,
Usually when if i upgrade the firmware or disable the server certificate that will do a job for me.
but not in this particular one, so i need concrete solution for this.
Note : other phones are working well & good no any problem only randomly i face this problem.

 

[leejor]

Just one set with the issue?
What type of transfer are they doing, attended, blind?
Exactly how do they do the transfer?
Does this happen when transferring to any extension, or just one (some)?
Doe this happen when transferring outside calls, other extensions, both?
Did this start recently?

 

[Brock_4118]

Hi Leejor,
As of now only one IP phone have that issue & yes to any extension when he try to transfer that person phone gets on hold. First he put my call on hold & then he make new call & then when he tried to transfer my call to that 3rd person that 3rd person phone gets on hold.
It happens randomly, i had this issue many times but when i upgrade the firmware or disable the server certificate of the phone it worked most of the time, i dont know what could be the exact reason behind this.

 

[Brock_4118]

Hello Guys,
I have just notice that he can do blind transfer but not the other one,
like when he inform the 3rd person & try to transfer it doesn't work.

 

[JohnS_3CX]

go to the extension that has the problem, and under the tab Options > Troubleshooting check to see if all 3 options are enabled. Compare this with your other extensions that work well, I assume they already have the 3 options ticked.

Also since you are using STUN, I assume the server is somewhere else and the phones connect remotely instead of locally correct? How many extensions are using deskphones in that office?

 

[leejor]

. First he put my call on hold & then he make new call & then when he tried to transfer my call to that 3rd person that 3rd person phone gets on hold.

To do an attended transfer on the Yealink, requires that you press the transfer button "TRAN", (not the hold button), dial the extension you wish to transfer to, speak with them, then press the transfer button again. Is this how you are doing it?

https://www.3cx.com/blog/voip-howto/blind-attended-transfer-yealink/