Advanced SIP Account Settings
This section describes the optional features and SIP account parameters that are set in the section.
The advanced SIP account settings allow you to increase security, optimize call quality and ensure compatibility with different PBXs. We recommend that only experienced administrators change the settings.
Go to of the account to be set up.
SIP Functions
The REFER method allows for dynamic forwarding of active calls between various SIP identities, which provides a more flexible control of communication flows.
The PRACK method provides reliable acknowledgement of continuous call states between devices, which improves the communication quality and stability in SIP systems.
Media
Receive Only Encrypted Calls (SRTP) – allows you to receive SRTP-encrypted calls only. Unencrypted calls will be automatically rejected. At the same time, TLS is recommended as the SIP transport protocol for higher security.
Encrypted Outgoing Calls (SRTP) – set that outgoing calls shall be SRTP encrypted on this account. At the same time, TLS is recommended as the SIP transport protocol for higher security.
Adaptive Control of Video Quality – enable the use of extended RTP profile for feedback via the RTCP (RTP/AVPF). Enable the use of interactive video quality control according to RFC-4585 allowing for adaption of the video data flow to the currently available network connection quality.
Broadsoft Compatibility Mode – set the Broadsoft PBX compatibility mode. Having received re-invite from a PBX in this mode, the intercom replies by repeating the last sent SDP with currently used codecs instead of sending a complete offer.
Use MKI in SRTP Packets – enable the use of MKI (Master Key Identifier) if required by the counterparty for master key identification when multiple keys rotate in the SRTP packets.
Do Not Play Incoming Early Media – disable playing of the incoming audio stream before call pick-up, which is sent by some PBXs or other devices. A standard ringtone will be played instead.
Advanced Configuration
Sending KeepAlive Packets – set that the device shall send STUN/CRLF packets to the registrar on a regular basis and also SIP OPTIONS during calls to keep the setup connection active.
SRV Record Rotation – allow SRV record rotation for SIP Proxy and Registrar. It is an alternative method of transition to backup servers in the event of main server failure or unavailability.
IP Address Filter – enable the blocking of SIP packet receiving from addresses other than SIP Proxy and SIP Registrar. The primary purpose of the function is to enhance communication security and eliminate unauthorized phone calls.
Evaluating Older Backup Status -
QoS DSCP Value – set the SIP packet priority in the network. The set value is sent in the TOS (Type of Service) field in the IP packet header. Enter the value as a decimal number.