Access Edge or A/V edge for Skype

Question

Dear Expert,
I received question from this customer and partner. 
In TechNet told us about open port from Access Edge instead A/V edge when using Audio/Video with Skype, Is it correct? They are wondering, please help to explain.
http://technet.microsoft.com/en-us/library/jj618376.aspx
Role/Protocol/TCP or UDP/Port
Source IP address
Destination IP address
Notes
Access/SIP(MTLS)/TCP/5061
Public IM connectivity partners
Edge Server Access interface
For federated and public IM connectivity that use SIP.
Access/SIP(MTLS)/TCP/5061
Edge Server Access interface
Public IM connectivity partners
For federated and public IM connectivity that use SIP.
Access/SIP(TLS)/TCP/443
Clients
Edge Server Access interface
Client-to-server SIP traffic for external user access.
A/V/RTP/TCP/50,000-59,999
Edge Server Access interface
Live Messenger clients
Used for A/V sessions with Windows Live Messenger if public IM connectivity is configured.
A/V/STUN,MSTURN/UDP/3478
Edge Server Access interface
Live Messenger clients
Required for public IM connectivity with Windows Live Messenger.
A/V/STUN,MSTURN/UDP/3478
Live Messenger clients
Edge Server Access interface
Required for public IM connectivity with Windows Live Messenger.

Answer 1

I feel that that's a typo.  It doesn't agree with other Lync 2013 TechNet documents such as
http://technet.microsoft.com/en-us/library/gg425891.aspxwhich specify these ports should be opened to/from the Edge Server A/V Edge service interface.
Alternatively, inbound UDP/3478 should be destined to the A/V edge.  You can see in the first column, that they correctly identify the A/V role, but the typo is in the IP address that it should be sent to.  Someone got excited with cut and paste.
I believe you're right to question it.
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
SWC Unified Communications