111  VoIP Subscriber Gateways 
 
-  Transmitted packets – number of RTP packets transmitted during the call; 
-  Transmitted bytes – number of bytes transmitted during the call; 
-  Received packets – number of RTP packets received during the call; 
-  Received bytes – number of bytes received during the call. 
Table 3.1 – Transient states and reasons for call clearing output into statistics 
Incoming or outgoing occupation 
Subscriber in the call state 
TAU subscriber put a remote subscriber on hold 
TAU subscriber was put on hold by a remote subscriber 
Reasons for call clearing 
TAU subscriber put the phone offhook, didn't perform a call and put 
the phone back on hook 
Remote subscriber is busy 
Invalid number is dialled 
No response from subscriber 
Incoming call to non-existent number 
Outgoing call to non-existent number 
Call to unavailable direction 
Remote subscriber clearback 
Local  or  remote  failure  that  has  occurred  during  the  connection 
establishment.  Possible  error  reasons:  mismatch  codecs,  reboot, 
source lack (band pass) and etc. 
Redirecting  (before the call – CFB, CFNA, CFU or during the call-CT) is 
performed by a remote subscriber 
Redirecting (before the call – CFB, CFNA, CFU or during the call-CT) is 
performed by TAU subscriber 
Subscriber status, when the ‘Call Transfer’ service is performed  
Ranking of records 
Table records can be gradated by any parameter if click on the arrow of column header by left 
mouse button. The direction of ranking is specified next to the header that is highlighted in red color 
and can be changed by pressing the left button of mouse.  
 
- put in order of increasing; 
 
- put in order of decreasing.