281
Table 244 Configuration items
Item Description
SIP Listening Transport
Layer Protocol
• UDP—Specify UDP as the transport layer protocol for incoming SIP calls
and enables UDP listening port 5060.
• TCP—Specify TCP as the transport layer protocol for incoming SIP calls
and enables TCP listening port 5060.
• TLS—Specify TLS as the transport layer protocol for incoming SIP calls
and enables TLS listening port 5061. If you select this option, you must
select a certificate from the Certificate list.
By default, both the UDP and TCP listening ports are enabled, and the TLS
listening port is disabled.
Configure this item in either of the following scenarios:
• If the device is the call receiver, you must enable the listening port of the
transport layer protocol used by the incoming calls.
• If TCP or TLS is selected as the transport layer protocol when the device
initiates a call, you must specify it as the SIP listening transport layer
protocol in this item. Otherwise, no register request can be initiated.
Resetting the setting for this item deletes the established connections.
Configuring media security
Select Voice Management > Call Connection > SIP Connection from the navigation tree, and
click the Session Properties tab to access the page as shown in Figure 666.
Figure 666
Con
figuring media security
Table 245 Configuration item
Item Description
Media Protocol
• RTP—Specify the Real-time Transport Protocol (RTP) as the media flow
protocol for SIP calls.
• SRTP—Specify the Secure Real-time Transport Protocol (SRTP) as the
media flow protocol for SIP calls.
By default, the RTP protocol is applied.
When both the RTP and SRTP protocols are specified as the media flow
protocols for SIP calls:
• If the device is the call initiator, both two media flow protocols are carried in
the INVITE message for the receiver to select.
• If the device is the call receiver, the SRTP protocol is first used for media
flow negotiation. If the negotiation fails, the RTP protocol is used.
Configuring caller identity and privacy
Select Voice Management > Call Connection > SIP Connection from the navigation tree, and
click the Session Properties tab to access the caller identity and privacy configuration page, as
shown in Figure 667.