P31003C1020M1000276A9, 01/2018
OpenScape Cordless IP V2, Administrator Documentation 43
Provider and PBX profiles
Configuring telephony server profiles
Network data of the service provider
Outbound proxy mode
The DECT IP multicell system allows you to configure an outbound proxy. Despite of any other SIP protocol rules,
if activated (Always), the system will always send all outgoing requests towards this outbound proxy. It can be an
outbound proxy in the local network provided by the local network provider or in the public network provided by
the network/VoIP provider.
Specify when the outbound proxy should be used.
If the further outbound proxy configuration is identical to the proxy and registrar configuration it is useless and will
be ignored.
Outbound server address
This is the address, where the device should send all SIP requests to and where (in case of successful registration)
it expects to receive requests from.
Enter the (fully qualified) DNS name or the IP address of your provider's outbound proxy.
Example: 10.100.0.45 or sip.domain.net or sipproxy01.domain.net
If the Outbound server address field is empty, the system behaves independently of the selected mode, as with
Outbound proxy mode = Never.
Outbound proxy port
This is the port number of the outbound proxy server, where the device should send all SIP requests to (and where
it in case of successful registration expects to receive requests from)
Enter the communication port used by the outbound proxy.
Range: 1-65535; Default: 5060 (for UDP/TCP), 5061 (for TLS)
Outbound proxy port is empty and Outbound server address is a name:
Always: All signalling and voice data sent by the system is sent to the outbound proxy.
Never: The outbound proxy is not used.
The DHCP option 120 ”sip server” sent by a SIP phone would internally overrule the outbound proxy
address and port setting. Outbound proxy mode is still and exclusively in the hands of the local
device administrator. By setting Outbound proxy mode to Never, you can prevent any usage of
DHCP option 120 by the DECT VoIP phone. To allow for DHCP option 120, you should set Outbound
proxy mode to Always.
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