Skype to Lync voice call fails

Hello
I have configured the Lync federation with Skype. I have IM and Presence interoperability working both ways. Voice is working from Lync to Skype.
My problem is just voice calls from skype to lync. The calls fails and I get a no answer in the skype client. Looking to the Edge logs I can see a "SIP/2.0 480 Temporarily Unavailable" received from the front end that is forwarded
to the skype.
Any idea is welcome
JJ

have you opened the required ports for federation?. have a look at the port requirement and see if you missed any or the direction that you opened.
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.
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