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codec preference

Configuring Voice over IP for Cisco MC3810 Series Concentrators 37

Command Modes

Voice class conﬁguration

Command History

Usage Guidelines

The routers at opposite ends of the WAN may have to negotiate the codec selection for the network

dial peers. The codec preference command speciﬁes the order of preference for selecting a

negotiated codec for the connection. Table 1 describes the voice payload options and default values

for the codecs and packet voice protocols.

Release Modification

12.0(2)XH This command was introduced on the Cisco AS5300.

12.0(7)T This command was first supported on the Cisco 2600 and

3600 series routers.

12.0(7)XK This command was first supported on the Cisco MC3810

series.

Table 1 Voice Payload-per-Frame Options and Defaults

Codec Protocol Voice Payload Options (bytes)

Default Voice

Payload (bytes)

g711alaw

g711ulaw

VoIP

VoFR

Vo AT M

80, 160

40 to 240 in multiples of 40

160

240

g723ar53

g723r53

VoIP

VoFR

Vo AT M

20 to 220 in multiples of 20

20 to 240 in multiples of 20

g723ar63

g723r63

VoIP

VoFR

Vo AT M

24 to 216 in multiples of 24

24 to 240 in multiples of 24

g726r16

VoIP

VoFR

Vo AT M

20 to 220 in multiples of 20

10 to 240 in multiples of 10

g726r24

VoIP

VoFR

Vo AT M

30 to 210 in multiples of 30

15 to 240 in multiples of 15

30 to 240 in multiples of 15

g726r32

VoIP

VoFR

Vo AT M

40 to 200 in multiples of 40

20 to 240 in multiples of 20

40 to 240 in multiples of 20

120

g728 VoIP

VoFR

Vo ATM

10 to 230 in multiples of 10

10 to 240 in multiples of 10

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 77 78

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