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New Member

No Ringback heard on incoming calls form PSTN when transfered

Hello guys!

I have a Cisco 2921 as a h323 voice gateway connected to a CUCM 8.5. When a PSTN call is placed and a directory number answers, if this call gets transefered the PSTN caller does not get the ringback tone but still get transfered. I already check the Service Parameters of Send User info to true and also on the voice gateway tried the progress_ind setup enable 3 on the outboind dial peer to CUCM with no success. What else I need to verify? Thanks in advanced!

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Accepted Solutions
Cisco Employee

Re: No Ringback heard on incoming calls form PSTN when transfere

OK, looks like you got Sip trunk as well,  so best option here is to use the annuciator. As, in SIP you cannot send 180/183 for already established call. So make sure you have an annuniciator registered and included in the MRGL of h323 GW, and change the service paramater to have annunciator.

7 REPLIES
Green

No Ringback heard on incoming calls form PSTN when transfered

Hi,

On your  H323 IOS gateway try adding

tone ringback alert-no-pi to the pots dial peer

E.g.

dial-peer voice 9 pots

desc *** OUTGOING CALLS TO PSTN ***

tone ringback alert-no-pi

destination-pattern 9T

port 0/0/0:15

!

Regards

Alex

Regards, Alex. Please rate useful posts.
New Member

No Ringback heard on incoming calls form PSTN when transfered

Thanks for the reply. I configured as you adviced but still the PSTN is not getting ringback on transfers. Thanks again.

Cisco Employee

Re: No Ringback heard on incoming calls form PSTN when transfere

hello there,

Is this the call flow:-

PSTN----CIsco GW---h225----CCM----IP phone--transfer ---IP phone (in same cluster).

Some questions:-

++ Are you  doing any external transfer?

++ I understand you cant hear the ringback, but did you hear MOH during the call transfer?

++ And you will have three options for user info in Service paramaeter, which one did you use ?

################################################################################################


Send H225 Uer info:-

This parameter specifies which message Cisco CallManager sends for the  ringback tone or tone on hold. Valid values follow:
Use ANN for Ring Back:  Use Cisco SCCP Annunciator to play ringback tone (available in Cisco CallManager  release 4.0 and later)
User Info for Call Progress Tone: Send H.225 user  information message to IOS gateway to play ringback tone or tone on hold (This  is the default.)
H225 Info for Call Progress Tone: Send H.225 information  message to IOS gateway to play ringback tone or tone on hold
Cisco  CallManager Version 3.1 does not support the H.225 Information message, so  choose 'User Info for Call Progress Tone' if you are using intercluster trunks  and any of the clusters is running Cisco CallManager Version 3.1 or earlier.  However, if all of the clusters are running Cisco CallManager 3.2(2a) or a later  release, you can choose 'H225 Info for Call Progress Tone.'


This is a required field.

Default:  User Info for Call Progress Tone

################################################################################################

++ If you choose the default, then you should see similar message during call transfer in the GW.

++ Can you place a test call and collect the following debugs:- (debug h225 asn1, debug h245 asn1, debug h225 q931 &  debug voip ccapi inout with the calling details. )

H225.0 INCOMING PDU ::=

value H323_UserInformation ::=

    {

      h323-uu-pdu

      {

        h323-message-body information :

        {

          protocolIdentifier { 0 0 8 2250 0 5 }

          callIdentifier

          {

            guid 'D66E5D8E60EE11E183C7E9D31167CDD6'H

          }

        }

        h245Tunneling FALSE

      }

    }

++ You can try annuniciator option, but make sure the h323 GW MRGL  has annuciator in it.

New Member

Re: No Ringback heard on incoming calls form PSTN when transfere

Thanks for the reply! Excdellent information and well detailed explanation. Let me narrow down the situation because it is more specific than I explained in the first post:

The situation is as follows: When a PSTN caller initiates the call and the Unity Connection auto-attendant answers, the call gets connected as it should be, but when the users press the desired extension, the Unity announces to the user "Please hols while I trnasfer your call" as it should be, then for a brief moment the PSTN caller hears the MoH while the Unity dials the desired extension, then when the PSTN call gets transfered to the desired extension and the desired extension starts to ring, the PSTN caller does not hear ringback until either the extension gets answer or the voicemail takes over.

I tested routing the iplot number directly to an extension and when the PSTN caller gets transfered, it gets MoH until the other person nsweres or the Voicemail takes over. So the issue is only when the Unity Connection auto-attendant answers and initiates the transfer of the PSTN incoming call to an internal directory number.

The call f;lows is as follows:

PSTN (SIP trunk) ----> Cisco Voice GW (h225) ----> CCM ---> Unityt Connection AA ---> IP Phone--transfer ---> IP phone

Im using the default  User Info for Call Progress Tone on  the service parameters in the CUCM.

Thanks again!

Cisco Employee

Re: No Ringback heard on incoming calls form PSTN when transfere

OK, looks like you got Sip trunk as well,  so best option here is to use the annuciator. As, in SIP you cannot send 180/183 for already established call. So make sure you have an annuniciator registered and included in the MRGL of h323 GW, and change the service paramater to have annunciator.

New Member

Re: No Ringback heard on incoming calls form PSTN when transfere

Excellent, it is working beautifully. Thanks again for your help! Great explanations.

Re: No Ringback heard on incoming calls form PSTN when transfere

You're rigth! ANN in MRG of SIP Trunk!

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