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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.

5 Replies 5

Cisco Employee
Cisco Employee

can you add the show run from the gw.


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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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

Hello All

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



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