T38G transfer failed to an other phone or PSTN

[Digicel AFG]

hello,

We encounter a serious problem for Transfer Call on your Yealink T38G phones to other phones:

- Yealink T42G
- Yealink T46G
- Linksys SPA962

We use the following version of frimware:

- T38G: 38.70.1.33

- T42G: 29.72.0.55

- T46G: 28.72.0.45

The problem is:

When an external call is received (ex. 0921) and we try to transfer the call to another extensions (ex. 0924) or PSTN (ex. mobile phone) by dialing Transfer-"the number need"-Transfer, extension 0924 hears the ring but when she answers the call she hears the voice of 70921, not the outside caller. The outside caller hears MOH.
The display of 0921 shows "transfer failed" and the call is still on hold.

We have the same problem with all the yealink phone (T38G, T42G, T46G), we use France Tones on the phones.

We use BroadSoft 18.sp1 system.

Please help us.

Thanks,
Digicel AFG