User guide

Chapter 6 — Using the Software
Multi-Tech Systems, Inc. 89
FROM Details
Gateway Name
alphanumeric
Identifier for the VOIP gateway that originated this call.
IP Address
n.n.n.n
IP address of the VOIP gateway from which the call was received.
Options
FEC, SC
Displays VOIP transmission options used by the VOIP gateway originating the call.
These may include Forward Error Correction or Silence Compression.
TO Details
Gateway Name
alphanumeric
Identifier for the VOIP gateway that completed (terminated) this call.
IP Address
n.n.n.n
IP address of the VOIP gateway at which the call was completed.
Options
Displays transmission options used by VOIP gateway terminating the call.
Supplementary Services Info
Call Transferred To
phone number
Number of party called in transfer.
Call Forwarded To
phone number
Number of party called in forwarding.
IP Statistics
IP statistics screen
UDP versus TCP. (User Datagram Protocol versus Transmission Control Protocol). UDP provides unguaranteed,
connectionless transmission of data across an IP network. By contrast, TCP provides reliable, connection-
oriented transmission of data.
Both TCP and UDP split data into packets called “datagrams.” However, TCP includes extra headers in the
datagram to enable retransmission of lost packets and reassembly of packets into their correct order if they
arrive out of order. UDP does not provide this. Lost UDP packets are irretrievable; that is, out-of-order UDP
packets cannot be reconstituted in their proper order.
Despite these obvious disadvantages, UDP packets can be transmitted much faster than TCP packets -- as much
as three times faster. In certain applications, like audio and video data transmission, the need for high speed
outweighs the need for verified data integrity. Sound or pictures often remain intelligible despite a certain
amount of lost or disordered data packets (which comes through as static).