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Some email providers have security filters that prevent users from receiving or viewing large attachments, from receiving scheduled emails and similar. Register with server every – Set how often you want the device to register with the SIP server for the existing SIP accounts.ĭTMF payload type – Changes the default payload type for DTMF. The reason for switching is to avoid fragmentation, and the switch can take place if a request is within 200 bytes of the maximum transmission unit (MTU) or larger than 1300 bytes.Īllow via rewrite – Select to send the local IP address instead of the router's public IP address.Īllow contact rewrite – Select to send the local IP address instead of the router's public IP address. UDP-to-TCP switching – Select to allow calls to switch transport protocols from UDP (User Datagram Protocol) to TCP (Transmission Control Protocol) temporarily. Under Additional, select additional options. Under Audio, select at least one audio codec with the desired audio quality for SIP calls. Use NAT traversal when the device is connected to the network from behind a NAT router or a firewall. Under NAT traversal, select the protocols you want to enable for NAT traversal. Some firewalls might block RTP traffic on certain port numbers.

The default start port for media transport is 4000. RTP start port – Enter the port used for the first RTP media stream in a SIP call.

Enter a different port number if required. The signaling traffic through this port is encrypted with Transport Layer Security (TLS). TLS port – The network port used for encrypted SIP communication. The signaling traffic through this port is non-encrypted. SIP port – The network port used for SIP communication. Under Call handling, set the timeout and duration for the call.

To allow the device to receive incoming calls, select Allow incoming calls. Go to System > SIP > SIP settings and select Enable SIP. To better understand how P2P works, see Peer-to-peer SIP (P2PSIP).įor more information about setting options, see SIP.

Use peer-to-peer when the communication is between a few user agents within the same IP network and there is no need for extra features that a PBX-server could provide.