Call establishment with direct routing
======================================

EP1				GK				EP2
===             ==              ===

----ARQ-------->
<---ACF---------

----Setup------------------------->
<----------------Call Proceeding---

                   <------ARQ------
                   -------ACF----->

<----------------Alerting----------
<----------------Connect-----------


Call establishment with GK routing (spec)
=========================================

EP1				GK				EP2
===             ==              ===

----ARQ-------->
<---ACF---------

----Setup------->
<--Call Proceeding-
                  ----Setup------->
                 <-Call Proceeding-

                   <------ARQ------
                   -------ACF----->

                   <---Alerting----
<---Alerting---
                   <---Connect-----
<---Connect----


Call establishment with GK routing (current implementation)
===========================================================

EP1				GK				EP2
===             ==              ===

----ARQ-------->
<---ACF---------

----Setup------->                                      !!!
                  ----Setup------->                    !!!
                 <-Call Proceeding-                    !!!
<--Call Proceeding-                                    !!!

                   <------ARQ------
                   -------ACF----->

                   <---Alerting----
<---Alerting---
                   <---Connect-----
<---Connect----