Calls drops when transferring to mobile phone

[totaycs]

Hi all,

We’re running 3CX v20 with an AAPT SIP trunk. Direct outbound calls to mobiles and landlines work fine.

From SIP logs:
Direct mobile dial = works.
Transfer to mobile = fails. 3CX sends a BYE (UserTerminated) shortly after.

What I’ve done so far:
Checked outbound rules → mobiles route correctly.
Verified in the exported trunk XML that IsSupportReinvite=0 and IsSupportReplaces=0.

Anyone have similar issue?

 

[Alphabetic]

Blind transfer or attended?

How many SC you got?

 

[totaycs]

Blind transfer

Blind transfer or attended?

How many SC you got?

Hi ! it's blind transfer and we have 4 SC

 

[leejor]

Could the issue be the caller ID , being sent, when doing a transfer? Check the 3CX Activity log to see if your provider is rejecting the call , for that reason. Different transfer types send different caller ID, you may be trying to send the CID of the extension.