Author Topic: Ring back issue on Call transfer  (Read 2545 times)

Offline pradeepgali

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Ring back issue on Call transfer
« on: November 19, 2014, 03:52:49 PM »
We found two different behaviors in call transfer.
1.   If the call is transferred from DUT1 immediately as soon as the PSTN B number is dialed, ringback exists.
2.   If the call is transferred from DUT1 after PSTN B started ringing, there is not ring back(MOH exists).

I have attached the traces
Call flow is as follows:
PSTN A (214 250 0685) calls DUT 1 (6468477620)
DUT 1 answers two way audio present.
DUT 1 presses transfer
DUT 1 calls PSTN B (9405358999)
DUT 1 Presses Transfer to complete the transfer
PSTN B rings PSTN A does not hear ringback
PSTN B answers call
Two way audio is present
PSTN A terminates call.

I am in Version 7.0 PR1 Software load: 13.0.0.83
I have attached the trances for reference.

Looking at the packet capture for the call with no ringback, packet 2652 pauses audio on the incoming leg
(to DUT1) through "a=inactive" for 6 seconds until packet 2964 from the Mitel takes the call off hold.

The call with good ringback has the "a=inactive" from the MiTel at packet 3473, however, audio is resumed 300ms later on packet 3500.

IP Addresses:
Mitel 3300: 10.35.31.85
MBG: 10.64.3.2

Is there any SIP peer profile settings or any other settings that can resolve this issue?


Offline pradeepgali

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Re: Ring back issue on Call transfer
« Reply #1 on: November 20, 2014, 09:55:03 AM »
We found two different behaviors in call transfer.
1.   If the call is transferred from Mitel 3300 immediately as soon as the PSTN B number is dialed, ringback exists.
2.   If the call is transferred from Mitel 3300 after PSTN B started ringing, there is not ring back(MOH exists).

I have attached the traces
Call flow is as follows:
PSTN A (214 250 0685) calls DUT 1 (6468477620)
DUT 1 answers two way audio present.
DUT 1 presses transfer
DUT 1 calls PSTN B (9405358999)
DUT 1 Presses Transfer to complete the transfer
PSTN B rings PSTN A does not hear ringback
PSTN B answers call
Two way audio is present
PSTN A terminates call.

I am in Version 7.0 PR1 Software load: 13.0.0.83
I have attached the trances for reference.

Looking at the packet capture for the call with no ringback, packet 2652 pauses audio on the incoming leg
(to DUT1) through "a=inactive" for 6 seconds until packet 2964 from the Mitel takes the call off hold.

The call with good ringback has the "a=inactive" from the MiTel at packet 3473, however, audio is resumed 300ms later on packet 3500.

IP Addresses:
Mitel 3300: 10.35.31.85
MBG: 10.64.3.2

Is there any SIP peer profile settings or any other settings that can resolve this issue?


 

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