Information Technology Reference
In-Depth Information
Regulatory compliance may require that IM chats be preserved. CUPS can provide this ca-
pability by using a PostgreSQL external database. Third-party compliance applications
may provide more features than a simple PostgreSQL database store; capabilities such as
inline virus scanning of IMs and antispam measures for IM are among the more common
features. If a third-party compliance application is in use, all chats are sent through the
compliance server; this means that if the server is not available to CUPS, no IMs can be
sent. Figure 14-9 illustrates CUPS integration with an external PostgreSQL server.
Cisco Unified
Presence
PostgreSQL
Server
Cisco Unified
Personal
Communicator
XMPP
ODBC
Figure 14-9
CUPS Integration with External Compliance Server
CUPS and QoS Considerations
Because Quality of Service (QoS) is so vital to successful Unified Communications de-
ployments, some measures must be taken to ensure that CUPC traffic is appropriately
processed by QoS mechanisms. CUPC marks traffic outbound from the user workstation
with values appropriate for voice, video, and signaling traffic. Normally, all traffic coming
from the user workstation is untrusted and marked down to a low QoS value by the first
QoS-enabled device that handles it; this behavior must be modified by specifying the
port ranges that CUPC uses and applying the appropriate QoS markings to that traffic.
This requires that the network device (switch, router, firewall, and so on) have the capabil-
ity to classify traffic based on port number, mark the traffic as appropriate for the QoS
environment, and apply a QoS policy to forward the traffic to specific destination ad-
dresses with appropriate bandwidth and delay guarantees. It is possible that the OS on the
workstation running CUPC may not support the QoS marking outbound, but this is in-
creasingly unlikely in modern LAN environments.
Table 14-2 lists the protocols transmitted by CUPC, along with their port numbers and a
brief description.
Key
To p i c
Table 14-2
Protocols, Port Numbers, and Descriptions of CUPC Outbound Traffic
Port
Number
Protocol
Description
69
UDP
Connects to the TFTP server to download the TFTP file.
80
TCP
HTTP
Connects to services such as Cisco Unified MeetingPlace for meet-
ings, or Cisco Unity or Cisco Unity Connection for voicemail
features.
143
IMAP
(TCP/TLS)
Connects to Cisco Unity or Cisco Unity Connection to retrieve and
manage the list of voice messages for the user, and the voice mes-
sages themselves.
389
TCP
Connects to the LDAP server for contact searches.
