Multi Device Access operation in dual-stack mode

Last Updated : Apr 17, 2026 |
Prolog information
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When the phone is configured in the IPv4 and IPv6 dual-stack mode with Multi Device Access (MDA) support, the signaling address family is selected according to the order of precedence level. The settings are done in both 46xxsettings.txt file and System Manager. The order of precedence is as follows:
  • Phone through Administration menu settings
  • Web user interface
  • Avaya Aura® System Manager
  • Settings File
  • DHCP
  • LLDP
If you log in with your extension on MDA2 during a call and the signaling address mode is different from that of MDA1, then a limited service icon momentarily displays on MDA2. MDA2 automatically switches its signalling address family to match MDA1.
Parameter
Description
SIP_CONTROLLER_LIST_2
Describes the list of SIP Proxy or Registrar servers separated by comma when the SIP device is configured for the dual-stack operation.
Valid values are 0 to 255 characters in the dotted decimal or colon-hex format.
The syntax is:
host[:port][;transport=xxx]
where
  • host is IP addresses in dotted-decimal format or hex format.
  • [:port] is the port number. The default values are 5060 for TCP and 5061 for TLS.
  • [;transport=xxx] is the transport type and xxx is either TLS or TCP. The default value is TLS.
For example, SIP_CONTROLLER_LIST_2="10.16.26.88:5060;transport=tcp"
SIGNALING_ADDR_MODE
Describes the SIP registration over IPv4 or IPv6 and selects the preferred Avaya Aura® Session Manager for phones supporting the dual-stack mode. The Avaya Aura® Session Manager IP address is selected according to the parameter SIP_CONTROLLER_LIST_2.
Valid values are:
  • 4: IPv4. This is the default value.
  • 6: IPv6