2N BRI Lite/Enterprise v1.1 User Manual
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First RTP port (even: 1024 – 65524) – set the number of the first RTP port.
The RTP port number must be even according to the recommendation.
Last RTP port (even: first RTP+10 – 65534) - set the number of the last RTP
port. The RTP port number must be even according to the recommendation.
The recommended minimum RTP port range is 10.
Codecs settings – set details for the G.711a/u or G.729 codecs.
Codecs priority – set the types of the speech codecs to be preferred.
Priority 1
Priority 2
Priority 3
IP addresses
SIP proxy (IP->GSM) - the SIP proxy IP address from which 2N BRI gateway
awaits the GSM outgoing call requests.
Tip
If you keep the default values (0.0.0.0), 2N BRI gateway will receive
requests from any IP address.
SIP proxy (GSM->IP) – the SIP proxy IP address to which 2N BRI gateway
turns in the case of GSM incoming calls.
SIP registrar - SIP registration server IP address.
NAT firewall - NAT firewall IP address.
STUN server - STUN server IP address (Simple Traversal of UDP through NATs
(Network Address Translation)) for obtaining the public IP address with which
2N BRI gateway operates in the Internet. You are recommended to complete
this field if 2N BRI gateway is installed in a private network separated from
the Internet via NAT or firewall. The pre-set port for sending requests to
STUN is 3478.
Next STUN request (60-6553, 0=off) [s] – update of information on the 2N
BRI gateway public IP address. Use this parameter to configure the frequency
of queries routed to the STUN server.
Note
In case the GSM gateway is installed behind the NAT, make proper routing
settings in the NAT router for the relevant ports (SIP, RTP, STUN).
Integrated firewalls can also affect VoIP calls!
Tip
Should you have call troubles (such as unilateral audibility, connection
errors), make sure that all the active elements on the VoIP call route have
been set properly. For easy troubleshooting, try the point-to-point
connection with the software IP phone (SJ phone, e.g.) in your PC and, at
the same time, apply network analyzer tracing (WireShark –
Refer to p. 79 for easy tracing by the BRI gateway.