Configuring H.323-to-SIP Interworking
Figure 9-16 shows a sample book acclimated to configure H.323-to-SIP interworking with a
Cisco UBE router. The Cisco Unified Communications Manager array in San Jose routes
calls to the SIP carrier via a Cisco UBE router. The affiliation amid the Cisco Unified
Communications Manager and the Cisco UBE router is H.323 and the connection
between the Cisco UBE router and the SIP carrier is SIP.
Chapter 9: Establishing a Affiliation with an Internet Telephony Account Provider 541
IP IP
IP WAN
SIP
SIP Carrier
192.168.10.254
R1
Cisco UBE
Phone1-1
2001
Phone1-2
2002
San Jose
Cisco Unified Communications
Manager Cluster: 192.168.1.1
V
Figure 9-16 H.323-to-SIP Interworking Scenario
You can chase these accomplish to configure H.323-to-SIP interworking:
Step 1. Accredit H.323-to-SIP interworking.
Step 2. Configure H.323 and SIP punch aeon to avenue all-embracing calls amid the
Cisco Unified Communications Manager array and the SIP carrier.
Step 1: Enabling H.323-to-SIP Interworking
As with an H.323-to-H.323 connection, by absence a Cisco IOS aperture will not allow
connections amid an H.323 and a SIP VoIP punch peer. To change this behavior and
allow H.323-to-SIP connections, use the allow-connections h323 to sip command in
voice account agreement mode. Then affair the allow-connections sip to h323 command
to accredit SIP to H.323 calls, as approved in Example 9-4.
Example 9-4 H.323-to-SIP Interworking
R1(config)#voice account voip
R1(config-voice-service)#allow-connections h323 to sip
R1(config-voice-service)#allow-connections sip to h323
Step 2: Configuring Punch Peers
For a SIP (rtp-nte)-to-H.323 (h245-alphanumeric) alarm via a Cisco UBE router, if any RTP
named telephony accident (NTE) packets are beatific afore the H.323 endpoint answers the
call, the DTMF arresting is not heard on a absolute aperture (TGW).
542 Authorized Self-Study Guide: Cisco Articulation over IP (CVOICE)
Note alter achievement reveals that the H245 out-of-band letters are beatific to the TGW.
However, the digits are not heard on the phone.
To abstain sending both in-band and out-of-band tones to the approachable leg back sending
Cisco UBE calls in-band (rtp-nte) to out-of-band (h245-alphanumeric), configure the
dtmf-relay rtp-nte digit-drop command on the admission SIP punch peer. On the H.323
side, configure either dtmf-relay h245-alphanumeric or dtmf-relay h245-signal.
This can additionally be acclimated for H.323-to-SIP calls. Example 9-5 illustrates this dial-peer
configuration.
Example 9-5 Dial-Peer Configuration
R1(config)#dial-peer articulation 2000 voip
R1(config-dial-peer)#description To Cisco Unified Communications Manager
R1(config-dial-peer)#destination-pattern 2...
R1(config-dial-peer)#session ambition ipv4:192.168.1.1
R1(config-dial-peer)#dtmf-relay h245-alphanumeric
R1(config-dial-peer)#exit
R1(config)#dial-peer articulation 9011 voip
R1(config-dial-peer)#description To All-embracing SIP Carrier
R1(config-dial-peer)#session agreement sipv2
R1(config-dial-peer)#destination-pattern 9011T
R1(config-dial-peer)#session ambition ipv4:192.168.10.254
R1(config-dial-peer)#dtmf-relay rtp-nte digit-drop h245-alphanumeric