Reference12r2:Gateway/Interfaces/Media Properties
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Media Properties
The physical interface may be registered using H.323 or SIP. For the VOIP call the media properties can be configured.
- General Coder Preference
- The coder preference (Coder, Framesize, Silence Compression) to be used if a non-local media address is detected. If the preference is marked as exclusive no other coder is offered.
- Local Network Coder
- The coder preference if a local media address is detected.
- Enable T.38
- Switches on Fax detection and switchover to T.38
- Audio FAX support
- Switches on voice coder e.g. G.711 for the FAX interface. This feature requires two free DSP channels and is not available on IP2x, IP302, IP305, IP800, IP0011, IP311 gateways and IPVA.
- No DTMF Detection
- Special mode to switch off DTMF detection during a call. If checked DTMF is transferred inband during a call. Use G711 coder and a link with no packet loss to transfer DTMF inband. This option can be used to transfer continuous DTMF tones for some special applications. Out of band DTMF tones have a fixed length of approx 150ms.
- Enable PCM
- Enable the media to be connected using the local timeslot switch if the call is between physical interfaces of the same gateway.
- Media-Relay
-
- Off
- No Media Relay is performed for calls thru this interface
- On
- If the interface of one call leg is set to Media-Relay On, Media relay is performed
- Auto
- If the interfaces of both call legs are set to Media-Relay Auto, Media Relay is performed if the call is between a private an a public network, based on the private network configurations under IP4/General/Settings
- Video
- If this checkmark is set, Video Media Relay is also done.
- No ICE
- ICE is turned off for calls routed through this interface
- No RTCP-MUX
- RTCP-MUX(RTP and RTCP share the same port/connection, instead of using two separate connections) is turned off for calls routed through this interface
- MOH Mode
- Special mode to use a physical interface as Music on Hold Source. The media is one way only and multiple calls are connected to the same channel on the physical interface. In this case the configured coder is used exclusively, even if not marked as exclusive.
- Record to (URL)
- HTTP URL where the recording file is to be stored. HTTP server must allow write access (PUT) at this location. One PCAP file is written for every call via this interface containing both RTP streams. Audio streams can be played using Wireshark. PCAP file can be converted into WAV file using pcap2wav tool. The filename of the recording file has the form <conference ID>-<mac>-<seq>.pcap
- conference ID
- A guid identifying the call across different hops. It is forwarded within the signaling. The CDRs generated by the PBX contain this conference ID.
- mac
- The Mac address of the device recording the call. Together with seq it is used to make sure the filename is unique if seperate devices record the same call.
- seq
- A sequence number of the record starting with 0 after power up of the recording device. Together with mac it is used to make shure the filename is unique, especially to cover the case, that one device records the same call multiple times (e.g. incoming and outgoing)
- SRTP Cipher
- The encryption mode for RTP
- SRTP Key Exchange
-
- SDES-DTLS
- SDES and DTLS are supported. The preference is SDES
- DTLS-SDES
- SDES and DTLS are supported. The preference is DTLS
- SDES
- SDES only
- DTLS
- DTLS only
- None
- No encryption