HP-UX C SIP Stack Programmer's Guide (Novembery 2007)

58 HP-UX C SIP Stack Programmer’s Guide

Call-leg State Machine

REMOTE-ACCEPTED

TATE MACHINE

Figure 6-3 Remote-Accepted State Machine

RVSIP_CALL_LEG_STATE_MSG_SEND_FAILURE

This state is assumed only if the SIP Stack is compiled with the Enhanced DNS

feature. The call moves to this state when the call-leg failed to send a request

(the call-leg received a network error, 503 response or timeout on the request).

In this state your application can:

 Continue DNS—try to send the request to the next address in

the transaction DNS list. For more information see the Working

with DNS chapter.

 Give Up—terminate the call-leg or return to the previous state

of the call and not send the request, depending on the previous

state of the call-leg. For more information see the Working with

DNS chapter.

 Terminate the call-leg.

This state can be reached from the INVITING, PROCEEDING or

DISCONNECTING states.

INVITING PROCEEDING

REMOTE

ACCEPTED

CONNECTED

DISCONNECTING DISCONNECTED

200 OK Recv

Ack()/

ACK Sent

Disconnect()/

BYE Sent

(local disconnecting)

BYE Recv

(remote disconnected)