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Community Member

Always busy tone is coming with H.323 outbound calls

Hello Experts,

With H.323/FXO only four specific IP Phones can make outside calls and when i try to call outside call from remaining IP Phones it gives busy tone. Please check the H.323 gateway configuration below and let me know what could be the possible issue:

sh run
Building configuration...


Current configuration : 3976 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname TS_VOIP_GATEWAY
!
boot-start-marker
boot-end-marker
!
! card type command needed for slot/vwic-slot 0/2
!
no aaa new-model
dot11 syslog
!
!
ip cef
!
!
no ip domain lookup
multilink bundle-name authenticated
!
trunk group  FXO1
!
!
trunk group  1
max-calls any 4
description trunk group for FXO Ports
hunt-scheme round-robin
!
voice-card 0
no dspfarm
!
voice class h323 1
h225 timeout tcp establish 3
!
archive
log config
  hidekeys
!
interface FastEthernet0/0
ip address 192.168.80.254 255.255.255.0
duplex auto
speed auto
!
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.80.200
!
ip http server
no ip http secure-server
!
control-plane
!
!
!
voice-port 0/0/0
supervisory disconnect dualtone mid-call
output attenuation -3
cptone KW
timeouts interdigit 2
timeouts call-disconnect 5
timeouts wait-release 5
connection plar 4001
caller-id enable
!
voice-port 0/0/1
compand-type a-law
cptone KW
timeouts interdigit 2
connection plar opx 5555
caller-id enable
!
voice-port 0/0/2
compand-type a-law
cptone KW
timeouts interdigit 2
connection plar opx 7397
description *Operator no*
caller-id enable
!
voice-port 0/0/3
compand-type a-law
cptone KW
timeouts interdigit 2
connection plar opx 7858
caller-id enable
!
!
!
!
!
dial-peer voice 7337 voip
destination-pattern 4001
voice-class h323 1
session target ipv4:192.168.80.10
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
dial-peer voice 5555 voip
destination-pattern 5555
voice-class h323 1
session target ipv4:192.168.80.10
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
dial-peer voice 7858 voip
destination-pattern 7858
voice-class h323 1
session target ipv4:192.168.80.10
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
dial-peer voice 7397 voip
destination-pattern 7397
voice-class h323 1
session target ipv4:192.168.80.10
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
dial-peer voice 1 pots
destination-pattern [2-9].......
port 0/0/0
!
dial-peer voice 2 pots
destination-pattern [2-9].......
port 0/0/1
!
dial-peer voice 3 pots
destination-pattern [2-9].......
port 0/0/2
!
dial-peer voice 4 pots
destination-pattern [2-9].......
port 0/0/3

2 REPLIES

Re: Always busy tone is coming with H.323 outbound calls

You only have four POTS lines/ports in your configuration.  So, if there are 4 IP phones using 4 ports there is no more pie left for the other phones.  Which is why they are getting a busy tone most likely.   Unless there are some other ports/variables I am missing.

Oh, BTW the trunk group configuration you have in the config is not engaged until you actually assign ports to it (using the trunk-group <....> command under the voice-port) and configure dial-peers to use it (using trunkgroup under dial-peer).  Just an FYI.

HTH.

Regards,
Bill

Please remember to rate helpful posts.

HTH -Bill (b) http://ucguerrilla.com (t) @ucguerrilla

Please remember to rate helpful responses and identify

Community Member

Re: Always busy tone is coming with H.323 outbound calls

Thank you for your response. I am only able to call outside from the numbers mentioned in PLAR under voice port i.e. 4001 , 5555 , 7858 etc. If i will call from other extensions then it will give busy tone.

It's not necessary that only these numbers should make outside calls. I want all the IP Phones to use these four lines based on their availability.

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