Polycom SIP 2.2.0 Administrator's Manual page 198

Administrator's Guide SoundPoint IP / SoundStation IP
Attribute
reg.x.outboundProxy.transport
reg.x.proxyRequire
A - 86
Permitted
Values Default
DNSnaptr or DNSnap
TCPpreferred or tr
UDPOnly or
TLS or
TCPOnly
string Null
Interpretation
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.
The string that needs to appear in the
"Proxy-Require" header. If Null, no
"Proxy-Require" will be sent.