Method SipMessageRequestWithinDialog

SIP/SIPMessage.cpp:489–500

A request inside an invite is ACK, CANCEL, BYE, INFO, or re-INVITE. The only target-refresh-request is re-INVITE, which can change the "Dialog State". For ACK sec 17.1.1.3 the To must equal the To of the response being acked, which specifically contains a tag. ACK contains only one via == top via of original request with matching branch. TODO: ACK must copy route header fields from INVITE. sec 9.1

// 3. If no route-set, request-URI = remote-target-URI
// The remote-target-URI is set by the Contact header only from a INVITE or re-INVITE.
SipMessageRequestWithinDialog::SipMessageRequestWithinDialog(string reqMethod, SipBase *dialog, string branch) {
	this->msmCallId = dialog->callId();
	this->msmReqMethod = reqMethod;
	this->msmCSeqMethod = reqMethod;
	//this->msmReqUri = dialog->mInvite->msmReqUri;		// TODO: WRONG! see comments above.
	this->msmReqUri = dialog->dsInDialogRequestURI();		// TODO: WRONG! see comments above.
	this->msmTo = *dialog->dsRequestToHeader();
	this->msmFrom = *dialog->dsRequestFromHeader();
	this->msmCSeqNum = dialog->dsNextCSeq();	// The BYE seq number must be incremental within the enclosing INVITE dialog.
	if (branch.empty()) { branch = make_branch(reqMethod.c_str()); }
	this->smAddViaBranch(dialog,branch);
}

// This message exists to encapsulate the Dialog State into a SIP message.
// It is created on BS1 to send to BS2, which then uses it as a re-invite.