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is a communication device that connects two different networks. The response server is a
standard service device that implements the ECHO protocol.
C. STUN (RFC 3489)
The Simple Traversal of UDP over NAT (STUN) is a protocol that enables the SIP telephone
to detect the existence and type of the firewall installed in the computer. This parameter
indicates the SIP address of the STUN server.
Note: The STUN protocol supports the SIP gateway only.
D. Trunk Agent
The trunk agent protocol is a firewall traversal technology developed by Hybertone
Technology. It enables the products of Hybertone Technology to be applicable for most LANs.
It involves the address, port, user name and password. The trunk agent protocol supports
encryption on communications over the gateway. This feature needs the support of the server
developed by Hybertone Technology.
Media agent mode:
Mode 1: media encryption and agent (supported by all versions of relay servers).
Mode 2: media encryption and agent, supporting the transit over the specified port
(supported by V2 relay server).
Mode 3: media encryption and agent for the conversion of RTP data to TCP packet,
supporting the transit over the specified port (supported by the relay server
later than V2).
3.5.7 Dialing Rule
The COIP supports number dialing by rules. You can specify dialing rules in the dialing rule
parameter of the
“
Call Forwarding
”
.
3.5.7.1 Format of Dialing Rules
1. You can specify multiple rules, which are separated by the delimiter
‘
|
’
. For example,
“
00:-00|0:-0+86|:+86755
”
.
2. The number is matched from the left of the dialing rules to the right. When the number
matches the correct rule, the number stops matching. Otherwise, the number continues to
match the next rule.
3. The rule format is
“
AA:-aa+bb
”
, such as
“
0:-0+86
”
. Where,
“
AA
”
indicates the number to