Nera WILINK I System Manual page 201

PPS = (14.4 Kbps bit rate) / (288 bits) = 50 pps
Note: 288 bits = 36 bytes (voice payload) * 8 bits per byte
Bandwidth per call = total packet size (752bits) * 50 pps = 37.6 Kbps
Since Fax BW is higher than Voice BW, the Fax BW requirement mandates the
CG connection's attributes. This is true for all G.729 and G.723 codecs.
B.3.5 FAX RTCP BW Calculation
RTCP BW is 10% of RTP: 10 % of 37.6 Kbps is 3.76 Kbps.
B.3.6 QoS Profiles
B.3.6.1 CG QoS for RTP traffic
The calculated bandwidth required for RTP traffic is 37.6 Kbps (equivalent to a
Packet Size of 752 bits, or 94 bytes). Thus, the CG 38 QoS Profile parameters are:
Packet Size: 117 bytes
Sample Interval: 20 msec
B.3.6.2 RT QoS for RTCP and VoIP Signaling
The required bandwidth is 5.76 Kbps (3.76 Kbps for Fax RTCP plus 2 Kbps for
VoIP Signaling). We round it up to 6 Kbps. Thus, the required RT 6 QoS Profile
parameters are:
CIR: 6 Kbps
CT: Short
B.3.6.3 BE QoS for Data
As stated, the recommended QoS Profile for Data is BE 64, with the following
parameters:
MIR: 64 Kbps
CT: Medium
WILINK I MODULAR BASE STATION SYSTEM MANUAL
1 POTS Advanced VoIP G.729 Service Profile
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