Chapter 9: Network Requirements and Preparation Planning and Installation Guide
ShoreTel 11.1 135
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.
If you set the admission control bandwidth to 256 Kbps and G.729a voice encoding
is used, you can support up to 21 calls between this site and all other sites.
ShoreTel recommends that you configure the admission control bandwidth to be less than
the bandwidth of the actual WAN link. This provides sufficient bandwidth for call control
signaling and other data traffic.
28 4088 2380 1456 728
29 4234 2465 1508 754
30 4380 2550 1560 780
Bandwidth in Kbps per
Number of Calls Linear G.711 ADPCM G.729a
1 132 68 38 12
2 264 136 76 24
3 396 204 114 36
4 528 272 152 48
5 660 340 190 60
6 792 408 228 72
7 924 476 266 84
8 1056 544 304 96
9 1188 612 342 108
10 1320 680 380 120
11 1452 748 418 132
12 1584 816 456 144
13 1716 884 494 156
14 1848 952 532 168
15 1980 1020 570 180
16 2112 1088 608 192
17 2244 1156 646 204
18 2376 1224 684 216
19 2508 1292 722 228
20 2640 1360 760 240
21 2772 1428 798 252
Table 9-17 Bandwidth with cRTP
Bandwidth in Kbps
per Number of Calls Linear G.711 ADPCM G.729a
Table 9-16 Bandwidth Without cRTP
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