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.
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:
•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:
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