Cisco one way audio

[saxenanitesh8522]

Hi,

I have one way audio from PSTN to IP Phone.

1. From IP phone to IP phone its working

2. From IP phone to pstn line i can hear (outbound working)

3. PSTN phone to IP phone i am not able to hear. No voice is coming from that side (in bound not working from pstn to call gateway)

Can some help.

[Ayodeji Okanlawon · Accepted solution]

One way audio is always down to routing issue. Can your PSTN gateway ping the subnet of your ip phones?

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[saxenanitesh8522]

yes that i can ping the subnet as its been handle by inter vlan routing..

card type e1 0 3

network-clock-participate wic 3

network-clock-select 1 E1 0/3/0

!

isdn switch-type primary-net5

voice-card 0

no dspfarm

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

sip

  registrar server

!

controller E1 0/3/0

framing NO-CRC4

pri-group timeslots 1-31 service mgcp

!

!

interface FastEthernet0/1

no ip address

no ip unreachables

ip nat inside

ip virtual-reassembly

load-interval 30

duplex auto

speed auto

no mop enabled

!

interface FastEthernet0/1.10

description SUB_INT_SUPPORT

encapsulation dot1Q 10

ip address X.X.150.1 255.255.255.0

ip flow ingress

ip nat inside

ip virtual-reassembly

ip policy route-map AIRTEL_2

!

interface Serial0/3/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

no cdp enable

!

!

!

!

voice-port 0/3/0:15

!

ccm-manager redundant-host X.X.150.8

ccm-manager mgcp

no ccm-manager fax protocol cisco

ccm-manager music-on-hold

ccm-manager config server X.X.150.7 

ccm-manager config

!

mgcp

mgcp call-agent X.X.150.7 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

mgcp package-capability fm-package

no mgcp package-capability res-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface FastEthernet0/1.10

mgcp bind media source-interface FastEthernet0/1.10

!

mgcp profile default

!

!

dspfarm profile 1 conference

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

codec g729r8

codec g729br8

maximum sessions 2

associate application SCCP

!

dspfarm profile 2 mtp

codec g711ulaw

maximum sessions hardware 10

associate application SCCP

dial-peer voice 1 pots

service mgcpapp

port 0/3/0:15

[Ayodeji Okanlawon]

Are you doing some form of NATing as I can see NAT configs on the gateway..

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[Abhishek Singh]

Hi Nitesh,

Try pressing the question mark button on the phone and see the Tx and Rx messages that are flowing , and see whether there is a continous change in them. Also as mentioned above - please check if NAT scenario is there -- before you consider it to be specific TELCO issue.

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[saxenanitesh8522]

NAT is there for going outside and NO-NAT for VPN.

between my call manager and router its on the same subnet of X.X.150.1 and X.X.150.7 but ip phone on X.X.155.7 but there is inter-vlan routing happening.

[Abhishek Singh]

Did you press the question mark button on the phone to check the packet flow . It should provide a fair idea of whether the packets are going vice-a-versa.

Thanks.

Whatever level you reach getting better never stops -- Sachin Tendulkar

[Ayodeji Okanlawon]

So is there a firewall or VPN between the router and the IP Phones?

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"opportunity is a haughty goddess who waste no time with those who are unprepared"

[saxenanitesh8522]

No there is no firewall, its all in the same segment.

i can check the question mark statistics tomorrow and update if its working or not.

is there any configuration issue???