Nortel Networks NN43001-122 Manual de usuario descargar pdf (Pagina 15)

Overview 15

— Menu selection and call transfer time is 30 seconds, with a

completed call duration of 180 seconds.

— Busy Hour (BH) Auto Attendant usage is 0.35 calls per hour for

each Microsoft Unified Messaging user.

•

Auto Attendant operation requires the usage of two SIP trunks, which

remain in use for the duration of the call.

• If Microsoft Unified Messaging system usage differs from the call model

described for the purpose of SIP trunk table calculations, it is the

responsibility of the customer to monitor the actual usage of the system

and ensure that there are sufficient SIP trunks available for use.

Number of

UM Users

Typical

BH Call

Duration

(seconds)

Typical BH

CCS

Erlangs

(ccs/36)

Number of

SIP Trunks

(Erlang B

P05 Grade

of Service)

Number of

SIP Trunks

(Erlang B

P01 Grade

of Service)

Number of

SIP Trunks

(Erlang B,

Non-blocki

ng)

50 15000 150 4.17 8 10 24

100 30000 300 8.33 13 16 33

200 60000 600 16.67 22 26 49

500 150000 1500 42 48

1000 300000 3000 83 88 99 147

2000 600000 6000 167 170 187 254

3000 900000 9000 250 250 273 355

Nortel Communication Server 1000

Communication Server 1000 with Microsoft Exchange Server 2007 Unified Messaging Fundamentals

NN43001-122 02.04

24 October 2008

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Nortel Networks NN43001-122 Manual de usuario Pagina 15

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