[Spce-user] UA NAT identification

John Murray john.murray at skyracktelecom.com
Wed Jul 24 06:54:44 EDT 2013



How does SPCE recognise a UA is behind a NAT device? Can I force it to use


I have a cisco handset and a Xlite client which register correctly and call
can be made in both directions.

The device registrations on the OSS show as 'NAT yes'


I also have an Avaya IP Office PBX behind another NAT router (Draytek 2830
with SIP ALG off) that registers correctly and can place outbound calls but
device registrations show as 'NAT no' so call to the device are send to the
private address.


Registrations from the Avaya come from the public address but contain a VIA
header with the private address which matches registrations from the cisco.

The main difference seems to be that the source port of the registration
packet from the public address is 5060 whereas from the cisco it has port


Also the private address of the Avaya is rather than rfc1918 but I
guess that shouldn't matter.


Best regards



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