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How can I block Skype from my network?

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Article ID: KB7798 KB Last Updated: 05 Mar 2017Version: 6.0
Summary:
Is there any way to effectively block Skype calls (inbound and outbound) from my network?
Symptoms:
Skype was specifically designed to elude firewalls and filters.
Solution:
The Juniper Security Research Lab has released two new attack objects on March 1, 2006 that can assist users who wish to identify and block outgoing Skype connections.

Due to the Skype protocol's specific evasion techniques these attack objects can be very intensive on the inspection process; we recommend deploying these attack objects only on IDP sensors that monitor traffic for an outbound WAN link. LAN deployment is not recommended.

The 2 attack objects can be found in the VOIP/Internet Telephony Group under the Skype sub-group.
    (INFO) Skype: Login Attempt 1
    (INFO) Skype: Login Attempt 2

These signatures are available on IDP versions 3.0 and above, and ISG with IDP security modules.

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