
3. Use Table 6: Trunk traffic Poisson 1 percent blocking on page 40 to find the CCS
value and obtain the number of PSTN trunks (in the cell to the left of the CCS
number). If the CCS value is between two values in the trunks column, choose the
higher number of trunks. For trunk traffic greater than 6068 CCS, allow 30.34 CCS
per trunk.
4. Multiply the number of PSTN trunks by two to obtain the number of SIP Access
Ports required.
Table 6: Trunk traffic Poisson 1 percent blocking
Trunks CCS Trunks CCS Trunks CCS Trunks CCS
1 0.4 51 1291 101 2847 151 4460
2 5.4 52 1322 102 2879 152 4492
3 15.7 53 1352 103 2910 153 4525
4 29.6 54 1382 104 2942 154 4557
5 46.1 55 1412 105 2974 155 4590
6 64 56 1443 106 3006 156 4622
7 84 57 1473 107 3038 157 4655
8 105 58 1504 108 3070 158 4686
9 126 59 1534 109 3102 159 4721
10 149 60 1565 110 3135 160 4754
11 172 61 1595 111 3166 161 4786
12 195 62 1626 112 3198 162 4819
13 220 63 1657 113 3230 163 4851
14 244 64 1687 114 3262 164 4884
15 269 65 1718 115 3294 165 4917
16 294 66 1749 116 3326 166 4549
17 320 67 1780 117 3359 167 4982
18 346 68 1811 118 3391 168 5015
19 373 69 1842 119 3424 169 5048
20 399 70 1873 120 3456 170 5081
21 426 71 1904 121 3488 171 5114
22 453 72 1935 122 3520 172 5146
23 480 73 1966 123 3552 173 5179
24 507 74 1997 124 3594 174 5212
Interworking requirements with CS 1000
40 Deployment Guide October 2010
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