Digigram IQOYA CALL Series User Manual page 17

The configuration of the system consists in the following:
● Set the destination IP address of the IP audio stream generated by IQOYA *MOBILE as the public IP
address of the router of the radio, and select a port number which is not used on that router.
● Audio compression used by IQOYA *MOBILE must be selected according to the network bandwidth
capacity. (e.g. Digigram advises not to require more than 64 kbps data stream rate on 3G, therefore use an
audio encoding format such as HE­AAC 32 kbps)
● Configure the router of the radio so as to forward UDP traffic coming on the selected port number to the
private IP address of IQOYA *CALL/LE, on a given port.
● Configure IQOYA*CALL/LE IP audio source. Listening port must be the same port value the incoming IP
audio stream on the router has been forwarded to.
As a consequence, as soon as IQOYA *CALL/LE decodes to its outputs the first IP audio frame coming from
IQOYA *MOBILE, it encodes its audio inputs and sends the corresponding IP audio stream to the IP address and
port from which it received the first frame from IQOYA *MOBILE. In other words, the same socket/port is used for
sending and receiving the RTP audio streams.
This method allows simple NAT traversal in 95% of use cases and does not require SIP.
Example:
Given parameters:
● Radio router public IP address = RouterPub_IP@
● IQOYA *CALL/LE private IP address on the radio LAN = IQOYA_IP@
Parameters to configure:
● IQOYA *MOBILE target IP address: set it to RouterPub_IP@
● IQOYA *MOBILE target IP port: select a port value unused on the radio router: RouterInPort
● IQOYA *MOBILE: set the encoding audio format adapted to the network characteristics and expected
audio quality.
● Radio Router: enter the port forwarding menu of the router to define the following forwarding rule
● IQOYA *CALL/LE: set listening port to IQOYAInPort in 'Preferences / Audio / Audio setup' of the IQOYA
webpage.
Symmetrical RTP mode can be used in all cases where:
­ a SIP server is not available or accessible
­ local network is overprotected, banning any VoIP signaling
­ SIP signaling is not useful
The following manual at hand will guide through installation, configuration, and operation of IQOYA *CALL and
IQOYA *CALL/LE.
I QOYA *CALL - IQOYA *CALL/LE
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