func (caller *endpoint) Invite(callee *endpoint) error {
// Starting a dialog.
callid := "thisisacall" + string(caller.dialogIx)
tagString := fmt.Sprintf("tag.%s.%s", caller.username, caller.host)
branch := "z9hG4bK.callbranch.INVITE"
caller.dialog.callId = callid
caller.dialog.from_tag = base.String{tagString}
caller.dialog.currentTx = txInfo{}
caller.dialog.currentTx.branch = branch
invite := base.NewRequest(
base.INVITE,
&base.SipUri{
User: &callee.username,
Host: callee.host,
},
"SIP/2.0",
[]base.SipHeader{
Via(caller, branch),
To(callee, caller.dialog.to_tag),
From(caller, caller.dialog.from_tag),
Contact(caller),
CSeq(caller.dialog.cseq, base.INVITE),
CallId(callid),
ContentLength(0),
},
"",
)
caller.dialog.cseq += 1
log.Info("Sending: %v", invite.Short())
tx := caller.tm.Send(invite, fmt.Sprintf("%v:%v", callee.host, callee.port))
caller.dialog.currentTx.tx = transaction.Transaction(tx)
for {
select {
case r := <-tx.Responses():
log.Info("Received response: %v", r.Short())
log.Debug("Full form:\n%v\n", r.String())
// Get To tag if present.
tag, ok := r.Headers("To")[0].(*base.ToHeader).Params.Get("tag")
if ok {
caller.dialog.to_tag = tag.(base.String)
}
switch {
case r.StatusCode >= 300:
// Call setup failed.
return fmt.Errorf("callee sent negative response code %v.", r.StatusCode)
case r.StatusCode >= 200:
// Ack 200s manually.
log.Info("Sending Ack")
tx.Ack()
return nil
}
case e := <-tx.Errors():
log.Warn(e.Error())
return e
}
}
}
func (caller *endpoint) nonInvite(callee *endpoint, method base.Method) error {
caller.dialog.currentTx.branch = "z9hG4bK.callbranch." + string(method)
request := base.NewRequest(
method,
&base.SipUri{
User: &callee.username,
Host: callee.host,
},
"SIP/2.0",
[]base.SipHeader{
Via(caller, caller.dialog.currentTx.branch),
To(callee, caller.dialog.to_tag),
From(caller, caller.dialog.from_tag),
Contact(caller),
CSeq(caller.dialog.cseq, method),
CallId(caller.dialog.callId),
ContentLength(0),
},
"",
)
caller.dialog.cseq += 1
log.Info("Sending: %v", request.Short())
tx := caller.tm.Send(request, fmt.Sprintf("%v:%v", callee.host, callee.port))
caller.dialog.currentTx.tx = transaction.Transaction(tx)
for {
select {
case r := <-tx.Responses():
log.Info("Received response: %v", r.Short())
log.Debug("Full form:\n%v\n", r.String())
switch {
case r.StatusCode >= 300:
// Failure (or redirect).
return fmt.Errorf("callee sent negative response code %v.", r.StatusCode)
case r.StatusCode >= 200:
// Success.
log.Info("Successful transaction")
return nil
}
case e := <-tx.Errors():
log.Warn(e.Error())
return e
}
}
}
