QoS
Enterprise
IP VoIP . , . , , Quality Of Service (QoS).
. , , VoIP, e-mail Wide Area Network (WAN) . , , 700 , 700 RTP . QoS [ Y.1541]. :
- : , , ;
- ( ): , . , end-to-end, . :
- : : . - . , . , ;
- : . , , , ;
- (): , , ;
- : , , , .
- . . , , .

- QoS, , . :
A=Bmax/F
A , Bmax , F . 10-20% . , . QoS .
, QoS , . QoS ; . Cisco IOS :
- Priority queuing ( - PQ) Custom queuing ( - CQ);
- Modified deficit round robin - MDRR - ( Cisco 1200 );
- , Type Of Service (ToS) (WFQ) ( Cisco 7x00 );
- Class-Based Weighted Fair Queuing (CBWFQ) , ;
- Low latency queuing (LLQ) . . , . Stacker () Predictor () - , Cisco IOS.
. , . , ( )/( ) , . TCP Real-time Transport Protocol (RTP) .
. , i i + 1 , , "end-to-end" . , , . :
- (propagation delay) (- );
- (serialization delay) , . , ;
- .

, , WAN 128 /. 5000 , , 40 . 66 (528 ). , :
t = 528/128000=0,004125=4.125 .
, 40 . 44.125 . :
D1+Q1+D2+Q2+D3+Q3+D4
1, , , :
t=528/2048000=0,00025781=0,258
, 40,258 .