[reSIProcate] Cisco DTMF

[Hong Yu]

I'm not sure what your setup is. When my client deals with Cisco
CallManager directly, I have to subscribe first for KPML event in order
to receive the notification from CallManager. I did have to modify DUM
to make subscribe/notify work though. The code base of DUM I have, which
is a couple of months old, didn't handle the incoming subscription
request of KPML event, if I recalled correctly.

 

Hong

 

________________________________

From: Matt Porter [mailto:mporter at calltower.com] 
Sent: Friday, April 14, 2006 2:37 PM
To: resiprocate-devel at list.sipfoundry.org
Subject: [reSIProcate] Cisco DTMF

 

In the past I have made some modifications to the DUM in order to
support dtmf using sip NOTIFY.  The changes were pretty straight forward
before, but now i am trying to sync up with the latest codebase, and
wanted to see if maybe someone out there had a better way to handle it.

 

just to quickly explain the way it works. When you receive an INVITE
from the gateway it will have a Call-Info header.

if your final 200 response to the invite contains that Call-Info then
NOTIFY will be used for DTMF instead of the rtp media stream.

 

So the stack has to be extended so you can receive unsoliticited NOTIFY
messages.

Im a little confused now where the best place to make this change is. it
used to be done in Dialog.cxx.. but the NOTIFY handling has changed
somewhat.

 

These were the 3 changes i had in the older codebase to support this (
probably a couple months old ).

 

void 
DialogUsage::send(SharedPtr<SipMessage> msg)
{
   //if (msg->isRequest())           <-----  !!!!  took this out,
because i need to add the "Call-Info" header !!!!
   {
      // give app an chance to adorn the message.
      onReadyToSend(*msg);
   }
   mDialog.send(msg);
}

 

class InviteSessionHandler
{

......existing code.............

 //!! Added this !!  (return 0, if you like the message)
 virtual int onUnsolicitedNotify(InviteSessionHandle,const SipMessage&
msg){ return -1; }

}

 

void 
Dialog::dispatch(const SipMessage& msg)

 

 

......existing code.............

 

  case NOTIFY:

 

   ......existing code.............

 

    //last chance to let the app decide if i likes this NOTIFY

  if( mDum.mInviteSessionHandler->onUnsolicitedNotify(
mInviteSession->getSessionHandle(), msg) != 0 )
  {
         SipMessage response;
         makeResponse(response, msg, 406);
        send(response);
  }

 

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