[SIPForum-discussion] Ring-back tone from calling side

[Ramachandra moorthy]

Dear All,

kindly clarify the below query

"A" subscriber  making call to "B" subscriber.In this scenario who will
provide ringback tone?
Recently one class-5 switch has been connected with our softswitch.We have
created SIP node with our softswitch.

But class5 switch expecting ringback tone from us if we are trying to make
call towards class-5 subscriber.

In SIP trace we found class-5 switch not sending SDP body in their
180-ringing message.

below is the 180-ringing message from class-5


Sequence NO.:21
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 10.190.26.142:5060;branch=z9hG4bK0de62d85.0
Record-Route: <sip:10.190.26.142:5060;lr>
Call-ID: 000010ea000077e5-0046-0792 at 10.190.26.142
From: "8212412345"<sip:8212412345 at 10.190.26.142
>;tag=0abe1a8e-00004b60000060ba
To: "08024441120"<sip:08024441120 at 10.190.26.142>;tag=qqoqsnho-CC-1003
CSeq: 4459 INVITE
Require: 100rel
Contact: <sip:10.191.54.22:5060;transport=udp>
Call-Info: <sip:08024441120 at 10.191.54.22:5060
;transport=udp;user=phone>;purpose=call-completion;m=NR
RSeq: 1
Content-Length: 4
Content-Type: application/isup;version=ITU-t92+


/*----------start isup message data----------
0000: 06 04 01 00
ACM----address-complete message

Mandatory parameter:
Backward call indicators::
Charge indicator:No indication
Called party status indicator: subscriber idle
Called party category indicator: No indication
End-to-end method indicator: No end-to-end method available
Interworking indicator: Interworking encountered
End-to-end information indicator: No end-to-end information available
ISDN user part indicator: ISDN user part not used all the way
Hold provided indicator: Hold not Request
ISDN access indicator: Termination access non-ISDN
Echo control device indicator: Incoming half echo control device not
included
SCCP method indication: No indication


Optional parameter:
*----------end isup message data--------


*Kindly clarify why called party expecting ring-back tone from calling
side.*


*With Regards *

*M. Ramachandramoorthy+91- 9600070877*
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