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Securing Cisco IP Telephony Networks by Akhil Behl

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Chapter 12. Cisco Voice Gateway Security

It is a peaceful morning and a fine day at the office. You are checking your e-mails, and there is one from your Telco helpdesk team about your organization XYZ’s previous month’s telephone bill. You open the e-mail, only to be shocked by the net payable amount of your PSTN bill! It shot through the roof, in the order of a five-digit figure. Stunned? Well, time to wake up to acknowledge that someone hacked your voice gateways and was spending hours chatting with his friends or talking with his fiancé overseas.

To dissuade such a situation, you must ensure that you implement the right security controls in your IP Telephony setup. Toll fraud has been an issue ever since the POTS days, and with the emergence ...

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