[reSIProcate] DUM - Cancelling INVITE if no response ever received

["Nash Tsai" <nash.teltel@xxxxxxxxx>]

> From the http://www.resiprocate.org/DUM_Ending_an_Invite_Session,
regarding "To send a CANCEL to cancel for a UAC INVITE", there is a
problem to this as if no response ever received (18x/2xx/4xx) the
onNewSession will not get triggered, hence no InviteSessionHandle, so
how do I got about cancelling an INVITE?

I haven't been working with main trunk's DUM, but the TelTel client
branch, it's probably DUM 1.0 thing, I used to work with has a
DialogUsageManager::cancelInvite(const resip::DialogSetId&
invSessionId), now it's gone, has it been moved elsewhere?

Thanks,
Nash