Polycom SIP 2.2.0 Manuel D’Utilisation

Administrator’s Guide SoundPoint IP / SoundStation IP 

A - 86

reg.x.outboundProxy.transport

DNSnaptr or
TCPpreferred or
UDPOnly or
TLS or
TCPOnly

DNSnap
tr

If set to Null or DNSnaptr: 
If reg.x.outboundProxy.address is a 
hostname and reg.x.outboundProxy.port is 0 
or Null, do NAPTR then SRV look-ups to try 
to discover the transport, ports and servers, 
as per RFC 3263. If 
reg.x.outboundProxy.address is an IP 
address, or a port is given, then UDP is used.

If set to TCPpreferred:
TCP is the preferred transport, UDP is used if 
TCP fails.

If set to UDPOnly:
Only UDP will be used.

If set to TLS:
If TLS fails, transport fails. Leave port field 
empty (will default to 5061) or set to 5061. 

If set to TCPOnly:
Only TCP will be used.

NOTE: TLS is not supported on SoundPoint 
IP 300 and 500 phones.

reg.x.proxyRequire

string

Null

The string that needs to appear in the 
“Proxy-Require” header. If Null, no 
"Proxy-Require" will be sent.