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FXO not giving the dial tone

Hi,

We have FXO ports on the router and SIP trunk towards ITSP. People used to dial into FXO and get the dial tone to callout using the SIP trunk. But after the upgrade of the IOS, this functionality has stopped. Now if you call the FXO, you get busy tone. The IOS has been upgraded from 12.4(11) to 15.1(M4) to basically its a big leap.

I strongly believe that we need to make some configuration to make it work like before.

Please advise.           

Attachached are the logs from the "debug vpm all"

1 ACCEPTED SOLUTION

Accepted Solutions

Re: FXO not giving the dial tone

Yes.
For toll fraud prevention, direct-inward-dial for ISDN and no secondary dialtone for FXO are intrduced by default from ios 15.1
So on voice port issue secondary dial-tone and all should work

HTH

Regards

Carlo

Sent from Cisco Technical Support iPhone App

Please rate all helpful posts "The more you help the more you learn"
3 REPLIES

Re: FXO not giving the dial tone

Yes.
For toll fraud prevention, direct-inward-dial for ISDN and no secondary dialtone for FXO are intrduced by default from ios 15.1
So on voice port issue secondary dial-tone and all should work

HTH

Regards

Carlo

Sent from Cisco Technical Support iPhone App

Please rate all helpful posts "The more you help the more you learn"
New Member

Re: FXO not giving the dial tone

Thanx ! It made my day.

Sent from Cisco Technical Support iPad App

Cisco Employee

Re: FXO not giving the dial tone

[+] for Calro

Here is the new feature complied in 15.X release

http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-2TNEWF.html

Toll Fraud Prevention

In Cisco IOS Release 15.1(2)T, the Toll Fraud Prevention feature is supported as below:

Source  IP address authentication is enabled on incoming IPv4 H323/ or SIP  trunk calls. The source IP address of any incoming IPv4 H323 or SIP  trunk calls will be authenticated based on:

Manually configured IP address trusted list.

VoIP dial-peer session target (the state of a VoIP dial-peer must be in "Operation State = UP")

Incoming IPv4 H323 or SIP trunk calls will be rejected if the authentication fails and the default cause-code call-reject (21) disconnects the call.

Execute the show ip address trusted list command to  display IP address trusted data and a list of valid source IP  addresses. The default behavior can be disabled as shown in the example  below:

voice service voip

no ip address trusted authenticate

Secondary  dial-tone is disabled for a call initiated from a FXO port. No  secondary dial-tone causes the outgoing call setup to fail if the called  number is NULL. The default behavior can be disabled as shown below:

voice-port

secondary dialtone

Direct-inward-dial  is enabled to prevent the toll fraud for incoming ISDN calls. Two-stage  dialing is disabled for incoming ISDN calls by default. The incoming  called number will then be used for outgoing call setup. The default  behavior can be disabled as shown in the example below:

voice service pots

no direct-inward-dial isdn

For more information, see the Cisco Unified Communications Manager Express System Administrator Guide at the following URL:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm.
html


Br,
Nadeem 

Please rate all useful post.

Br, Nadeem Please rate all useful post.
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