Cisco UBE Gateways in Enterprise Environments
Cisco UBE in enterprise deployments serve two main purposes:
■ External connections: A Cisco UBE can be used as a demarcation point within a
unified communications network and provides interconnectivity with external networks.
This includes H.323 voice and video connections and SIP VoIP connections.
■ Internal connections: When used within a VoIP network, a Cisco UBE can be used
to increase the flexibility and interoperability between different devices.
Following are some key features offered by Cisco UBE:
■ Protocol interworking: The Cisco UBE supports interworking of signaling protocols,
including H.323-to-H.323, H.323-to-SIP, and SIP-to-SIP.
■ Address hiding: A Cisco UBE can hide or replace the endpoint IP addresses used for
a media connection.
■ Security: A Cisco UBE can be placed in a demilitarized zone (DMZ) and provide
outside connectivity to external networks.
■ Video integration: In addition to VoIP services, a Cisco UBE also supports H.323
video connections.
■ Call Admission Control (CAC): A Cisco UBE can use Cisco IOS-based CAC mechanisms,
including the RSVP.
Table 9-1 lists key features and capabilities of the Cisco UBE. For detailed information
about the Cisco UBE, visit the product page: http://www.cisco.com/en/US/products/sw/
voicesw/ps5640/products_data_sheet09186a00801da698.html.
Table 9-1 Key Features of the Cisco UBE Gateway
Feature Details
Protocols H.323 and SIP
Network hiding IP network privacy and topology hiding
IP network security boundary
Intelligent IP address translation for call media and signaling
Back-to-back user agent, replacing all SIP-embedded IP addressing
CAC RSVP
Maximum number of calls per trunk
CAC based on IP circuits
CAC based on total calls, CPU usage, or memory usage thresholds
Protocol H.323 to H.323 (including Cisco Unified Communications Manager)
and signal H.323 to SIP (including Cisco Unified Communications Manager)
interworking SIP to SIP (including Cisco Unified Communications Manager)
Media support RTP and RTCP
Media modes Media flow-through
Media flow-around
Video codecs H.261, H.263, and H.264
Transport mode TCP
User Datagram Protocol (UDP)
TCP-to-UDP interworking
Table 9-1 Key Features of the Cisco UBE Gateway (continued)
Feature Details
DTMF H.245 Alphanumeric
H.245 Signal
RFC 2833
SIP Notify
Key Press Markup Language (KPML)
Interworking capabilities:
■ H.323 to SIP
■ RFC 2833 to G.711 in-band DTMF
Fax support T.38 fax relay
Fax passthrough
Cisco fax relay
Modem support Modem passthrough
Cisco modem relay
Supplementary Call hold, call transfer, and call forward for H.323 networks using H.450
services and transparent passing of Empty Capability Set (ECS)
SIP-to-SIP supplementary services (holds and transfers) support using REFER
H.323-to-SIP supplementary services for Cisco Unified Communications
Manager with Media Termination Point (MTP) on the H.323 trunk
NAT Traversal NAT traversal support for SIP phones deployed behind non-Application
Line Gateway (ALG) data routers
Stateful NAT traversal
QoS IP precedence and DSCP marking
Voice-quality Packet loss, jitter, and round-trip time
statistics
Number Number translation rules for VoIP numbers
translation Electronic Numbering (ENUM) support for E.164 number mapping into
Domain Name System (DNS)
Codecs G711 mu-law and a-law
G723ar53, G723ar63, G723r53, and G723r63
G726r16, G726r24, and G726r32
G728
G729, G729A, G729B, and G729AB
Internet Low Bitrate Codec (iLBC)
continues
Chapter 9: Establishing a Connection with an Internet Telephony Service Provider 525
Table 9-1 Key Features of the Cisco UBE Gateway (continued)
Feature Details
Transcoding Transcoding between any two families of codecs from the following list:
■ G711 a-law and mu-law
■ G.729, G.729A, G.729B, and G.729AB
■ G.723 (5.3 and 6.3 kbps)
■ iLBC
Security IP Security (IPsec)
Secure RTP (SRTP)
Transport Layer Security (TLS)
Authentication, AAA with RADIUS
authorization, and
accounting (AAA)
Voice media Tool Command Language (TCL) scripts support for application
applications customization
Voice Extensible Markup Language (VoiceXML 2.0) script support for
application customization
Billing Standard CDRs for accurate billing available through
■ AAA records
■ Syslog
■ Simple Network Management Protocol (SNMP)
Figure 9-2 shows the various deployment options for a Cisco UBE. Depending on the
deployment scenario, multiple Cisco UBEs might be required. Whether the gateways are
being deployed within a single VoIP network or used to interconnect to external VoIP
networks, the same concepts apply