H323 Extension VoIP

Last Updated : Apr 21, 2016 |
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Resource Id: extension102
These settings are shown for a H.323 IP extension.
These settings can only be edited offline. Changes to these settings require a reboot of the system.
Field
Description
IP Address
Default = 0.0.0.0
The IP address of the phone. The default setting accepts connection from any address. For phones using DHCP, the field is not updated to show the IP address being used by the phone.
The IP Address field can be used to restrict the the source IP address that can used by a Remote H.323 Extension. However, it should not used in the case where there is more than one remote extension behind the domestic router.
MAC Address
Default = 0000000000000 (Grayed out)
This field is grayed out and not used.
Codec Selection
Default = System Default
Set the supported codecs. Where possible, Avaya recommend that you use the same set of codecs for all IP Office systems, lines, and extensions.
The options are:
  • System Default - Use the codec list set in the system settings.
  • Custom - Configure a list of codec preferences for the line.
    • You can move codecs between the Unused and Selected sets and change the order of the codecs.
    • The codecs available are set by System SettingsSystemVoIP. The possible codecs are:
      • OPUS - Supported on Linux-based IP Office systems only.
      • G.711 ALAW/G.711 ULAW
      • G.729
      • G.723.1 - Supported on IP500 V2 systems only.
      • G.722 64K - Supported by Linux-based IP Office systems and on IP500 V2 systems with IP500 VCM, IP500 VCM V2 or IP500 Combo cards.
TDM | IP Gain
Default = Default (0dB). Range = -31dB to +31dB.
Allows adjustment of the gain on audio from the system TDM interface to the IP connection. This field is not shown on Linux based platforms.
IP | TDM Gain
Default = Default (0dB). Range = -31dB to +31dB.
Allows adjustment of the gain on audio from the IP connection to the system TDM interface. This field is not shown on Linux based platforms.
Supplementary Services
Default = H450.
Selects the supplementary service signaling method for use with non-Avaya IP devices. Options are None, QSIG and H450. For H450, hold and transfer are supported. Note that the selected method must be supported by the remote end.
Media Security
Default = Same as System.
These settings control whether SRTP is used for this extension and the settings used for the SRTP. The options are:
  • Same as System: Matches the system setting at System SettingsSystemVoIP Security.
  • Disabled: Media security is not required. All media sessions (audio, video, and data) is enforced to use RTP only.
  • Preferred: Media security is preferred. Attempt to use secure media first and if unsuccessful, fall back to non-secure media.
  • Enforced: Media security is required. All media sessions (audio, video, and data) is enforced to use SRTP only. Selecting Enforced on a line or extension that does not support media security results in media setup failures
    • Calls using Dial Emergency switch to using RTP if enforced SRTP setup fails.
Advanced Media Security Options
Default = Same as System.
Sets the requirements for SRTP when enabled.
  • Same as System:
    Use the same settings as configured on System SettingsSystemVoIP Security.
  • Encryptions: Default = RTP
    Sets which parts of a session SRTP protects using encryption.
  • Authentication: Default = RTP and RTCP
    Sets which parts of the session SRTP protects using authentication.
  • Replay Protection SRTP Window Size: Default = 64. Not adjustable.
    The IP Office will accept authenticated packets that have a sequence number that is higher than or within 64 packets of the highest-numbered packet already received.
  • Crypto Suites: Default = SRTP_AES_CM_128_SHA1_80.
    Set the crypto suites SRTP uses for encryption. The options are SRTP_AES_CM_128_SHA1_32 and SRTP_AES_CM_128_SHA1_80.
VoIP Silence Suppression
Default = Off
When enabled, when the IP Office detects silence during an IP call, it does not send any audio data.
  • Lines between IP Office systems using G.711 ignore this feature.
  • On trunks between networked IP Office systems, you must enable the setting at both ends.
Enable FastStart for non-Avaya IP Phones
Default = Off
A fast connection procedure. Reduces the number of messages that need to be exchanged before an audio channel is created.
Out of Band DTMF
Default = On
When on, DTMF is sent as a separate signal ("Out of Band") rather than as part of the encoded voice stream ("In Band"). The "Out of Band" signaling is inserted back into the audio by the remote end. This is recommended for low bit-rate compression modes such as G.729 and G.723 where DTMF in the voice stream can become distorted.
For Avaya 1600, 4600, 5600 and 9600 Series phones, the system will enforce the appropriate setting for the phone type.
Requires DTMF
Default = Off.
This field is displayed when System SettingsSystemVoIPIgnore DTMF Mismatch for Phones is set to On. It can be used to allow direct media connections between devices despite the devices having differing DTMF setting.
When Requires DTMF is set to Off, during the checks for direct media, the system ignores the DTMF checks if the call is between two VoIP phones. The two phones can be located on different systems in a Server Edition or SCN deployment. Set to On if the extension needs to receive DTMF signals.
SIP endpoints using simultaneous login, which do not have physical extensions in the configuration, are treated by the system as not requiring DTMF.
Note:
  • Direct media may still not be possible if other settings, such as codecs, NAT settings, or security settings, are mismatched.
  • When the system setting is set to On, the extension setting is ignored for contact center applications. Contact center application SIP extensions are always treated as requiring DTMF.
Local Tones
Default = Off
When selected, the H.323 phones generate their own tones.
Allow Direct Media Path
Default = On
This settings controls whether calls between IP endpoints and/or lines must go through the IP Office.
  • If disabled, calls go through the IP Office and use its resources. RTP relay allows calls between devices using the same audio codec to not require a voice compression channel.
  • If enabled, calls can take routes other than through the IP Office system. Both ends must support direct media and have matching VoIP settings. For example, both ends must use the same protocol (SIP or H.323), same addressing (IPv4 or IPv6), and so on. Otherwise, the call goes through the IP Office system.
    • For extensions, disabling Requires DTMF allows the extension to attempt direct media even if the other end has differing DTMF settings.
Reserve License
Default = None.
Avaya IP phones require an Avaya IP Endpoint license, non-Avaya IP phones require an 3rd Party IP Endpoint license. Normally the IP Office issues licenses in the order that devices register. This option allows this extension to be pre-licensed before the device registers. This can prevent a previously licensed phone becoming unlicensed following a system restart. The options are:
  • Reserve Avaya IP Endpoint License
  • Reserve 3rd Party IP Endpoint License
  • Both
  • None
Note:
  • When WebLM licensing is enabled, this field is automatically set to Reserve Avaya IP Endpoint License. The Both and None options are not available.
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