[Serusers] 488 Not acceptable

[Pavel Siderov]

    Hi guys,
I have a friend that's trying to call me but he gets message 

"488 Not Acceptable Here"

When I call him everything is ok. He is behind nat and uses Draytek Vigor 2600 ADSL router.
Stun tells:

Port restricted NAT detected - VoIP will work with STUN 
Does not preserve port number 
Does not supports hairpin of media 
Public IP address: his_ip

Any idea what is the problem?

Thanks in advance,
Pavel Siderov
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