• SIP Port: Enter the SIP port that is to be used e.g. behind a firewall. Only
change the standard port 5060 if this is absolutely necessary.
• Audio RTP Port: This is the port that is used for transferring the audio data.
You may need to change this setting for some SIP providers or firewall sce-
narios. If a router or firewall is used that performs NAT (Network Address
Translation), the router/firewall will have to redirect this port to the camera if
direct SIP connections (without SIP provider) are to be used.
• Use Router Address: Activate this option if you are establishing connections
via a router or firewall that performs NAT.
• Router Address: Enter the external IP address or the DNS name of the router
or firewall in this field. When contacting other SIP devices, the camera will
quote this address as its reply address instead of the camera's own (private)
IP address. The router/firewall has to redirect the audio data to the corre-
sponding port of the camera.
Codec Settings
The camera can use different audio codecs for transferring voice data. After the
connection has been established, the SIP devices will use the SIP protocol to agree
on a codec to use for encoding and decoding the audio data. If possible, you
should use the factory default settings of the MOBOTIX camera.
• Use PCMA Codec (G.711a): The PCMA audio codec creates uncompressed
audio data with 8 kHz and
a-Law encoding
; the audio quality corresponds to
that of ISDN. The actual bandwidth required by this codec is 86 kbps
(10.4 kB/s).
•Use GSM Codec: The GSM audio codec uses a lossy compression to reduce
the size of the audio data; the audio quality corresponds to that of GSM
mobile phones. The actual bandwidth required by this codec is 35 kbps
(4.2 kB/s).
• Use PCMU Codec (G.711u): The PCMU audio codec corresponds to the
PCMA codec except for encoding, which uses
µ-Law
instead of
a-Law
.
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com • 10.10.2006
240/288
Software Camera Manual Part 2
Three codecs:
- PCMA
- GSM
- PCMU
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