User manual

AT-323 IAX2 Phone User Manual (V1.43)
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2.set "sntp IP"to "255.255.255.255" then phone will not visit timer server to
get date and time. If one must know the current date and time, please set "sntp
IP" to the IP address of a local time server which has fast access.
Q17 How to set TOS field?
A:The 8-bit TOS field specifies how the datagram should be handled and is
broken down into five subfields: Let’s assume that bit 0 is the
most-important-bit and bit 7 is the least-important-bit.
Bit 0-2: Three PRECEDENCE bits specify datagram precedence, with values
ranging from 0 (normal precedence) through 7 (network control), allowing
senders to indicate the importance of each datagram.
Bit 3: Also called D bit. When set, the D bit requests low delay.
Bit 4: Also called T bit. When set, the T bit requests high throughput.
Bit5: Also called R bit. When set, the R bit requests high reliability.
Bit 6-7: Unused
TOS is just a hint to the routing algorithm that helps it choose among various
paths to a destination. An internet does not guarantee the type of transport
requested.
Q18 How to use call transfer function?
Two types of call transfer are implemented. Unattended call transfer and
Attended call transfer.
Unattended call transfer: A calls B and is connected with B, A want B to
transfer itself to C. B hold A, press the number of C, then press the “FWD”
key. Now B will hear busy tone and B can hang up now, and if C is available,
C will be ringing and A will hear ringback tone. Now A is transferred to C. If C
is unavailable, A will hear busy tone.
Attended transfer: A calls B and is connected with B, A want B to transfer
itself to C. B hold A, press the number of C, and press the “#”key to call C. If
C is available, C will be ringing, when C answers the call, B is connected with
C and start talking to C. Now B press “FWD” key to transfer A to C. Once the
“FWD” key is pressed, A and C is connected and A can start talking with C.
If C is unavailable, B will hear busy tone, then B can press “call hold” key to
switch back to A and tell A that C is not there.
Reserves the right to make changes in technical and product specification
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