
Trunk calculation: Method 1
Follow these steps:
1. Add the number of client users.
2. Locate the resulting number in the Number of Users column in Table 5: Poisson
trunk table on page 38.
3. Select the appropriate PSTN and SIP Access Port parameters based on the
required CCS per Users.
Table 5: Poisson trunk table on page 38 uses a Poisson value of P.01, which represents 1
percent blocking.
Table 5: Poisson trunk table
Number of
users
Parameter Up to 6
CCS per
User
Up to 12
CCS per
User
Up to 18
CCS per
User
Up to 24
CCS per
User
6
PSTN 5 6 6 6
SIP Access Port 10 12 12 12
12
PSTN 7 10 12 12
SIP Access Port 14 20 24 24
18
PSTN 9 13 18 18
SIP Access Port 18 26 36 36
24
PSTN 10 16 22 24
SIP Access Port 20 32 44 48
50
PSTN 17 28 38 48
SIP Access Port 34 56 76 96
75
PSTN 22 38 53 68
SIP Access Port 44 76 106 136
100
PSTN 28 48 68 87
SIP Access Port 56 96 136 174
150
PSTN 38 68 97 125
SIP Access Port 76 136 194 250
200
PSTN 48 87 125 162
SIP Access Port 96 174 250 324
Interworking requirements with CS 1000
38 Deployment Guide October 2010
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