Chapter 9: Network Requirements and Preparation Computing Admission Control Bandwidth
ShoreTel 8 Planning and Installation Guide 125
9.15.2 WAN Bandwidth per Call (Full Duplex) with cRTP
Some routers support a feature called RTP Header Compression (cRTP) that significantly
reduces the amount of IP overhead associated with voice over IP.
Table 9-17 defines the bandwidth used between sites when cRTP is being used. For
example:
If you want to support 10 calls between this site and all other sites, and G.729a
voice encoding is used, set the admission control bandwidth to 120 Kbps. Before
you enter this value, make sure the bandwidth is available at this site.
Bandwidth in Kbps
per Number of Calls Linear G.711 ADPCM G.729a
1 146 82 52 26
2 292 170 104 52
3 438 255 156 78
4 584 340 208 104
5 730 425 260 130
6 876 510 312 156
7 1022 595 364 182
8 1168 680 416 208
9 1314 765 468 234
10 1460 850 520 260
11 1606 935 572 286
12 1752 1020 624 312
13 1898 1105 676 338
14 2044 1190 728 364
15 2190 1275 780 390
16 2336 1360 832 416
17 2482 1445 884 442
18 2628 1530 936 468
19 2774 1615 988 494
20 2920 1700 1040 520
21 3066 1785 1092 546
22 3212 1870 1144 572
23 3358 1955 1196 598
24 3504 2040 1248 624
25 3650 2125 1300 650
26 3796 2210 1352 676
27 3942 2295 1404 702
28 4088 2380 1456 728
29 4234 2465 1508 754
30 4380 2550 1560 780
Table 9-16 Bandwidth Without cRTP
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