
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
300
PSTN 68 125 180 238
SIP Access Port 136 250 360 476
400
PSTN 82 162 238 317
SIP Access Port 164 324 476 634
500
PSTN 106 198 297 396
SIP Access Port 212 396 594 792
600
PSTN 125 238 356 475
SIP Access Port 250 476 712 950
700
PSTN 144 277 416 554
SIP Access Port 288 554 832 1108
800
PSTN 162 317 475 633
SIP Access Port 324 634 950 1266
900
PSTN 180 356 534 712
SIP Access Port 360 712 1068 1424
1000
PSTN 198 396 594 792
SIP Access Port 396 792 1188 1584
Example
In a system with 100 users and 6 CCS per User, use Table 5: Poisson trunk table on page 38 to
locate 100 in the Number of Users column. Use the Up to 6 CCS per User column to find the
following parameters:
• PSTN = 28
• SIP Access Port = 56
Trunk calculation: Method 2
Follow these steps:
1. To determine the number of PSTN trunks required, add the number of clients to
obtain the total number of users.
2. Multiply the total number of users by the desired CCS per User number to obtain a
CCS value.
Trunk calculation: Method 2
Deployment Guide October 2010 39
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