Telos Zephyr Xstream - Manual (Page 331)

USER’S MANUAL
Appendix 6 – Special Operational Modes 319
SIP Port (Default 5060)
SIP uses a TCP port, as its communication is bidirectional. The SIP port is
what is used for the connection protocol, that layer that initiates the
two RTP streams. The SIP port must match on both ends of a
connection.
UDP Port (Default 9150)
RTP streams are sent and received over the UDP port. This port is used
for both RTP and SIP modes, as SIP negotiates the creation of RTP
streams. The UDP port must match on both ends of a connection.
HTTP Port (Default 8080)
The TCP port used for HTTP streaming only (normal web‐pages are also
served over HTTP, but these are sent over port 80, the usual port to
which a web browser connects). A player which supports HTTP streams
can connect using the usual port notation (e.g.
http://www.xxx.yyy.zzz:PORT).
Note that prior to 3.0.1p, the Zephyr Xstream used port 8000 for HTTP
streaming.
TCP Port (Default 8800) This port is currently unused.
FIREWALLS AND ROUTERS
The Internet works because there is a central authority for doling out IP addresses. Any given
connection to the internet is permitted to use some number of designated addresses which can
be accessed by any machine that is also connected to the Internet. Most connections are
limited to one IP, with many more machines needing access to the network. This is the basic
purpose most routers.
When a device, such as the Xstream has a "public" (e.g. real) IP address it can be directly
accessed through a router. However, if there is a firewall (which may be built into the router, or
a separate box), or a "private" IP address the unit is not directly accessible. In these cases there
are a few options, as outlined below.
Port Forwarding
Port forwarding is very simple. When you have two connected networks, with
different numbering schemes, they must be connected by a router. The
machines on either side of the router cannot access each other. The router
itself can be accessed by machines on either network, however.