I have a problem to transfer incoming calls from the PSTN to an IP Phone. Here it is:
1) I call from PSTN to my IP Phone:::: OK
2) On the IP Phone, I transfer the call to another IP phone. I wait until this third party answers the call then I hit "Transfer" again and the call is transferred :::: OK
The problem :
1) I call from PSTN to my IP Phone :::: OK
2) On the IP Phone, I transfer the call to another IP phone, but this time I just dial the destination number and press the "Transfer" while receiving the ringback. On my PSTN phone I hear the ringback but once the call is answered, the call drops .
It only happens with my ISDN QSIG link to the PSTN. If I try this calling to a line connected on a FXO, it works just fine.
Is there any addictional parameter to be configured on the gateway ??
What you are seeing is the CCM default for Transfer with QSIG. By default CCM supports Consultive Transfer (your scenario number 1) and not Blind Transfer (your scenario number 2). Have a look;
Call Transfer - QSIG
Cisco CallManager supports call transfer by join only.
When a user transfers a call to another user, the QSIG identification service changes the connected name and number that displays on the transferred party phone. Call identification restrictions can impact what displays on the phone.
The call transfer supplementary service interacts with the path replacement feature to optimize the trunk connections when a call transfers to a caller in another PINX. For more information about path replacement, see
Hope this helps!