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FXO using diff codecs

0/0/1         g729r8     n  S_CONNECT             FXOLS_OFFHOOK

0/1/1         g711ulaw   n  S_CONNECT             FXOLS_CONNECT

whats will be the difference between above two since both are connected with different codec.

Everyone's tags (5)
Cisco Employee

FXO using diff codecs

can you add the show run from the gw.

Community Member

FXO using diff codecs


trunk group FXO


voice-card 0


dsp services dspfarm



voice rtp send-recv


voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none



  bind control source-interface Loopback10

  bind media source-interface Loopback10

  registrar server


voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g711alaw

codec preference 3 g729r8


voice class h323 1

  h225 timeout tcp establish 3



voice iec syslog


voice statistics type iec


interface Loopback10

ip address

h323-gateway voip interface

h323-gateway voip bind srcaddr



voice-port 0/0/1

trunk-group FXO

supervisory disconnect anytone

no battery-reversal

input gain -3

output attenuation -1

echo-cancel coverage 64

no comfort-noise

cptone SA

timing hookflash-out 50

connection plar 9801

description *** LOCAL LINE ***

music-threshold -45

bearer-cap Speech

caller-id enable


sccp local Loopback10

sccp ccm identifier 2 version 7.0

sccp ccm identifier 1 version 7.0



sccp ccm group 1

associate ccm 2 priority 1

associate ccm 1 priority 2

associate profile 1 register abcd_CONF

associate profile 2 register abcd_XCODE

associate profile 3 register abcd_MTP


dspfarm profile 2 transcode

codec g729r8

codec g711alaw

codec g711ulaw

maximum sessions 4

associate application SCCP


dspfarm profile 1 conference

codec g729br8

codec g729r8

codec g729abr8

codec g729ar8

codec g711alaw

codec g711ulaw

maximum sessions 1

associate application SCCP


dspfarm profile 3 mtp

codec g711ulaw

maximum sessions software 10

associate application SCCP


dial-peer voice 10 pots

trunkgroup FXO

tone ringback alert-no-PI

destination-pattern 900.T

fax rate disable

prefix 00


dial-peer voice 205 voip

description To CallManager Pub

destination-pattern 9801$

session target ipv4:

voice-class codec 1

voice-class h323 1

dtmf-relay h245-alphanumeric

req-qos guaranteed-delay audio

acc-qos guaranteed-delay audio

fax-relay ecm disable

fax rate 14400

fax nsf 000000

fax protocol pass-through g711ulaw

no vad



srst mode auto-provision all

max-ephones 110

max-dn 400

ip source-address port 2000

max-conferences 8 gain -6

transfer-system full-consult

create cnf-files version-stamp 7960 May 27 2012 17:41:04

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FXO using diff codecs


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Community Member

FXO using diff codecs

I want to know that why some FXO ports are in connected state with G.729r ans some with G.711ualaw. Thanks for your info

Community Member

FXO using diff codecs

Hello All

i have the same problem, any idea how to resolve this issue?



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