AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 638)

41-001343-01 Rev 03, Release 3.2.2 6-11
Single Call Restriction (6757i CT and 9480i CT only)
On the 6757i CT and 9480i CT, an administrator can enable or disable a single call restriction
between the 6757i CT and 9480i CT base unit and a call server.
When this feature is enabled (set to 1), you can make separate active calls from the 6757i CT and
9480i CT base unit and from the cordless handset. If this feature is disabled (set to 0), only one call
can be active at a time either from the base unit or from the handset. When this feature is disabled,
and you make an active call on either the base unit or the handset, any other attempt to make an
active call is put on hold. Also, when this feature is disabled, more than one call can negotiate
complex audio codecs since only a single call is decoding audio at a time.
You can configure this feature via the configuration files or the Aastra Web UI.
Configuring Single Call Restriction.
Configuration Files
For the specific parameters you can set in the configuration files for single call restriction on the 6757i CT
and 9480i CT, see Appendix A, the section,
“Single Call Restriction Setting” on page A-239.
Aastra Web UI
Step Action
1 Click on Advanced Settings->Global SIP->RTP Settings.
2 Enable the "Two Call Support" field by checking the check box.
(Disable this field by unchecking the box).