Configuring MultiVoice
MultiVoice configuration examples
MultiVoice Gateway for the MAX— User’s Guide
Preliminary November 23, 1998
6-11
Impact of configurable voice frames on IP packet size
The size of each IP packet is determined by the number of audio frames contained in each RTP
packet plus the size of the respective headers required to construct the frame.
The RTP packet header contains a time stamp and sequence number used to reconstruct the
voice message. The header size is fixed at 12 bytes. The size of the packet data will vary,
depending upon the type of audio codec defined for Pkt Audio Mode:
Table 6-1. Impact of configurable voice frames on IP packet size
Audio
codec
Number of
voice frames
RTP packet
size
Ethernet
frame size
G.729
1 @ 10ms ea.
22 bytes
64 bytes
2 @ 10ms ea.
32 bytes
74 bytes
3 @ 10ms ea.
42 bytes
84 bytes
4 @ 10ms ea.
52 bytes
94 bytes
5 @ 10ms ea.
62 bytes
104 bytes
6 @ 10ms ea.
72 bytes
114 bytes
7 @ 10ms ea.
82 bytes
124 bytes
8 @ 10ms ea.
92 bytes
134 bytes
9 @ 10ms ea.
102 bytes
144 bytes
10 @ 10ms ea.
112 bytes
154 bytes
G.723.1
1 @ 30ms ea.
32 Bytes
74 Bytes
2 @ 30ms ea.
52 Bytes
94 Bytes
3 @ 30ms ea.
72 Bytes
114 Bytes
4 @ 30ms ea.
92 Bytes
134 Bytes
5 @ 30ms ea.
112 Bytes
154 Bytes
6 @ 30ms ea.
132 Bytes
174 Bytes
7 @ 30ms ea.
152 Bytes
194 Bytes
8 @ 30ms ea.
172 Bytes
214 Bytes
9 @ 30ms ea.
192 Bytes
234 Bytes
10 @ 30ms ea.
212 Bytes
254 Bytes
