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Session Border Control
SBC functions interconnect independent VoIP networks for data and voice transport (Table 3). SBCs are critical components for
scaling networks from islands within a single customer network to an end-to-end IP community. The Cisco AS5400XM Universal
Gateway is a simple and cost-effective solution that provides a network-to-network demarcation interface for signaling interworking,
media interworking, address and port translations, billing, security, and QoS and bandwidth management. SBC functions operate
concurrently with the voice gateway functions. The Cisco AS5400XM Universal Gateway supports SBC for H.323 and SIP.
Table 3. SBC Features
Features Support Details
Voice
Protocols
●
H.323 and SIP
Protocol and signal interworking
●
H.323 to H.323 (including Cisco Unified CallManager)
●
H.323 to SIP (including Cisco Unified CallManager)
●
SIP to SIP (including Cisco Unified CallManager)
Media support
●
RTP and Real-Time Control Protocol (RTCP)
Media modes
●
Media flow-through
●
Media flow-around
Transport mode
●
TCP
●
UDP
●
TCP-to-UDP interworking
Fax support
●
T.38 Fax Relay
●
T.38 Digit Relay
●
Modem pass-through
●
Fax pass-through
●
Cisco Fax Relay
DTMF
●
H.245 Alphanumeric
●
H.245 Signal
●
RFC 2833
●
SIP Notify
●
Interworking capabilities:
H.323 to SIP
Supplementary services
1
●
Call hold, call transfer, and call forward for H.323 networks using H.450 and transparent passing of
Empty Capability Set (ECS) capabilities
CAC
●
RSVP
●
Maximum number of calls per trunk
●
CAC based on IP circuits
QoS
●
IP Precedence and differentiated-services-code-point (DSCP) marking
Network hiding
●
IP network privacy and topology hiding
●
IP network security boundary
●
Intelligent IP address translation for call media and signaling
Number translation
●
Number translation rules for VoIP numbers
●
ENUM support for E.164 number mapping into Domain Name System (DNS)
Security
●
IP Security (IPsec)
●
SRTP
●
TLS
Authentication, authorization,
●
AAA with RADIUS
1
Supplementary services supported only for H.323-to-H.323 networks at this time
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