VoIP

Last Updated : Jul 20, 2021 |

Navigation: System Settings > System > VoIP > VoIP

This tab is used to set the codecs available for use with all IP lines and extensions and the default order of codec preference.

  • Avaya H.323 telephones do not support G.723 and ignore it if selected.

  • For IP Office systems with H.323 lines and extensions, one of the G.711 codecs must be selected.

  • G.723 and G.729b are not supported by Linux-based IP Office systems.

  • The number of channels provided by an IP500 VCM 32 or IP500 VCM 64 card, up to a maximum of 32 or 64 respectively, depends on the actual codecs being used. This also applies to IP500 VCM 32 V2 and IP500 VCM 64 V2 cards. The following table assumes that all calls using the VCM use the same codec.

    Codec

    IP500 VCM 32 IP500 VCM 32 V2

    IP500 VCM 64 IP500 VCM 64 V2

    G.711

    32

    64

    G.729a

    30

    60

    G.723

    22

    44

    G.722

    30

    60

Paging from an IP device uses the preferred codec of that device. It is the system administrator's responsibility to ensure all the target phones in the paging group support that codec.

These settings must be edited offline. To enter offline editing, select Menu Bar Current User Icon > Offline Mode.

Field

Description

Ignore DTMF Mismatch for Phones

Default = Enabled.

When enabled, the following settings are visible and configurable:

  • Call Management > Extensions > Edit Extension > H323 VoIP > Requires DTMF

  • Call Management > Extensions > Edit Extension > SIP VoIP > Requires DTMF

When enabled, during media checks, the system ignores DTMF checks if the call is between two VoIP phones and the extension setting Requires DTMF is set to Off. The two phones can be located on different systems in a Server Edition or SCN deployment.

Allow Direct Media Within NAT Location

Default = Off.

When enabled, the system allows direct media between devices that reside behind the same NAT. Devices are behind the same NAT if their public IP addresses are the same.

  • Direct media may still not be possible if other settings, such as codecs, NAT settings, or security settings do not match.

The default behavior is to allow direct media between all types of devices (H323 and SIP remote workers and IP Office Lines behind a NAT). In the case of routers that have H323 or SIP ALG, it can be desirable to allow direct media only between certain categories of devices. This can be configured by adding the NoUser Source Number MEDIA_NAT_DM_INTERNAL. For information, see Call Management > Users > Add/Edit Users > Source Numbers.

Disable Direct Media For Simultaneous Clients

Default = Disabled

If enabled, the Allow Direct Media Within NAT Location settings for virtual extension records is disabled.

RFC2833 Default Payload

Default = 101. Range = 96 - 127.

This field specifies the default value for RFC2833 dynamic payload negotiation. Service providers that do not support dynamic payload negotiation may require a fixed value.

OPUS Default Payload

Default = 116.

This field specifies the default value and the range to be used for Opus codec.

This field is only used for Linux-based systems.

Note:

This field is not avialable on IP500v2, but the Unknown Codec passthrough and the OPUS settings are available to set individually.

Available Codecs

This list shows the codecs supported by the system and those selected as usable. Those codecs selected in this list are then available for use in other codec lists shown in the configuration settings. For example, the adjacent Default Selection list and the individual custom selection list on IP lines and extensions.

Warning:

Removing a codec from this list automatically removes it from the codec lists of any individual lines and extensions that are using it.

The supported codecs (in default preference order) are: Opus, G.711 A-Law, G.711 U-Law, G.722, G.729, and G.723.1. The default order for G.711 codecs varies to match the default companding settings of the system. G.723.1 and G.729b are not supported on Linux- based systems.

Default Codec Selection

By default, all IP (H.323 and SIP) lines and extensions added to the system have their Codec Selection setting set to System Default. That setting matches the codec selections made in this list. The buttons between the two lists can be used to move codecs between the Unused and the Selected parts of the list and to change the order of the codecs in the selected codecs list.
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VoIP