Voice and Video
23.2 Media Classification for Voice and Video Calls
SCALANCE W1750D UI
380 Configuration Manual, 02/2018, C79000-G8976-C451-02
Media Classification for Voice and Video Calls
SCALANCE W supports the following media classification types:
● Classify Media Flag
● STUN Based Media Classification
Voice and video devices use a signaling protocol to establish, control, and terminate voice
and video calls. These control or signaling sessions are usually permitted using predefined
ACLs. If the control signaling packets are encrypted, the AP cannot determine the dynamic
ports that are used for voice or video traffic. In these cases, the AP has to use an ACL with
the classify-media option enabled to identify the voice or video flow based on a deep packet
inspection and analysis of the actual traffic. SCALANCE W identifies and prioritizes voice
and video traffic from applications such as Skype for Business, Apple Facetime, and Jabber.
Skype for Business uses Session Initiation Protocol (SIP) over TLS or HTTPS to establish,
control, and terminate voice and video calls. Apple Facetime uses Extensible Messaging and
Presence Protocol (XMPP) over TLS or HTTPS for these functions.
The following CLI example shows the media classification for VoIP calls:
(scalance)(config)# wlan access-rule example_s4b_test
(scalance)(example_s4b_test)# rule alias <domain_name_for_S4B_server> match tcp 443
443 permit log classify-media
(scalance)(example_s4b_test)# rule any any match tcp 5060 5060 permit log classify-
media
(scalance)(example_s4b_test)# rule any any match tcp 5061 5061 permit log classify-
media
(scalance)(example_s4b_test)# rule any any match tcp 5223 5223 permit log classify-
media
(scalance)(example_s4b_test)# rule any any match any any any permit
(scalance)(example_s4b_test)# end (scalance)# commit apply
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