AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 55)

55 MD Evolution – Cordless DT412 / DT422 / DT432
During Calls
Non-IP Hand-Over Service
If your telephone system is integrated within a QSIG-MD private
network, and your calls are routed over your company's Intranet
network, which managed according to the IP-Trunking technique,
you may also have access to a non-IP hand-over service.
The quality of communications established over the Internet
network is generally good, mostly thanks to the implementation of
a system that gives voice calls priority over data transmitted on the
IP network.
However, occasions may arise where the quality of the voice
transmission of calls over the IP network is reduced. The non-IP
hand-over service allows you to request that your current call be
switched to a possible private digital tie line, or the public network
(depending on availability).
To activate this service during an ongoing call established over your
company's IP network: 7
Dial the suffix “7” to access to the Non-IP hand-over service.
Your call on the IP network is switched over to the non-IP network
immediately, without interrupting your call.
Note: This service is only available when your call has been
established on the IP network. The non-IP hand-over
service is not available for QSIG-MD private networks using
an Intranet network managed according to the IP-
Networking technique.