Installation guide

WAN Bandwidth per Call (Full Duplex) without cRTP Network Requirements and Preparation
3
ShoreTel 14.2 Planning and Installation Guide 67
WAN Bandwidth per Call (Full Duplex) without cRTP
Table 17 lists the bandwidth, including IP overhead, that is used for each voice call between sites when
RTP Header Compression (cRTP) is not used. The bandwidth depends on the voice encoding 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 260 Kbps. Before you enter this value, make
sure the bandwidth is available at this site.
 If you set your admission control bandwidth to 768 Kbps and G.729a voice encoding is used,
you can support up to 29 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.
Table 17: Bandwidth Without cRTP
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