page 12 Cisco Validated Design
Introduction
paTIenTsaFe sOlUTIOns—FasT lane
PatientTouch Call Flow
It is important to understand the data communication flows that comprise the complete Clinical Communication
solution. Not all of the flows may be Fast lane enabled, but those that ISV deemed critical may be enabled with
the Fast lane capable markings. Figure 9, for example, shows the interaction between the PatientSafe server and
iPhone handsets when placing or receiving a voice call with the PatientTouch application
Figure 10 PatientTouch call flow diagram
7088F
iPhone
iPhone
RTP (EF)
(Voice Stream)
SIP
(Best
Effort)
SIP
(Best
Effort)
PatientTouch SQL
Server
VMWareESXi
TCP
1443
UCS-B
In most deployment scenarios, call control requests are forwarded to the PatientTouch server using standard SIP
signaling. In a normal SIP call setup, the calling party sends a SIP Invite to the call control stating the directory
number to which it wishes to connect. The call control then issues an invite to the handset with the registered
destination directory number.
Table 1 PatientSafe Solutions—PatientTouch voice QoS recommendations
IP protocol
Apple NSURLsession
classification
Recommended
DSCP QoS
marking
Resulting
802.11e Layer 2
marking
SIP signaling
TCP or UDP port 5060 NET_SERVICE_TYPE_SIG CS3 UP 5
RTP stream
UDP NET_SERVICE_TYPE_VO EF UP 6
PatientSafe Solutions also support integration directly with Cisco CUCM. When integrating with CUCM directly,
unless a Cisco COP file for PatientTouch is present in your implementation, each PatientTouch device appears to
CUCM as a 3rd party SIP line side device. Alternatively, a turnkey SIP Trunk integration between a PatientTouch
Voice appliance and CUCM is available and provides equivalent and proven call and service quality without having
to manage PatientTouch devices within CUCM. For the Fast lane testing, other than codec selection, the use of
one call control over another has no bearing. PatientSafe Solutions' highly versatile audio codec selection scales
from low bitrate narrowband speech to high fidelity stereo music, providing unmatched interactive speech quality.
