Configuring Cisco Unified Border Elements
A Cisco Unified Border Element can be implemented in VoIP networks to enhance VoIP
network interoperability. This area describes how to apparatus Cisco UBE routers to
support agreement interworking amid H.323 and SIP networks.
Protocol Interworking Command
To accredit agreement interworking, use the allow-connections from-type to to-type command
in articulation account agreement mode. The from-type and to-type options specify
the signaling protocols, as abundant in Table 9-2.
Table 9-2 allow-connections Syntax Description
Parameter Description
from-type Originating endpoint type. The afterward choices are valid:
h323—H.323
sip—SIP
To Indicates that the altercation that follows is the affiliation target.
to-type Terminating endpoint type. The afterward choices are valid:
h323—H.323
sip—SIP
When interworking H.323 and SIP, the configuration is unidirectional; thus, if bidirectional
interworking is required, you need to configure the mirroring statement as well. For
example, if bidirectional H.323 to SIP interworking is required, you need to configure
allow connections h323 to sip as well as allow connections sip to h323.
Figure 9-14 and Example 9-1 illustrate a sample protocol interworking configuration.
Chapter 9: Establishing a Connection with an Internet Telephony Service Provider 539
H.323 Network SIP Network
Router1
Cisco UBE
V
Figure 9-14 Protocol Interworking Topology Example
Example 9-1 Protocol Interworking Configuration
Router1(config)#voice service voip
Router1(config-voice-service)#allow-connections h323 to 323
Router1(config-voice-service)#allow-connections sip to sip
Router1(config-voice-service)#allow-connections h323 to sip
Router1(config-voice-service)#allow-connections sip to h323