H.323 Gateway

• Independent of CUCM
• Distributed Dial Plan
• Unique features
  • NFAS Signaling
    • Non Facilitated Associated Signaling
  • Tcl/VXML
  • Integrated voice and data access
  • Fractional PRI
  • TDM: A-DID, E&M, PRI NFAS, CAMA, T1 FGD
  • TDM T3 Trunks
  • Set numbering plan type of outgoing calls

• Configure T1/E1 interface as in T1/E1 Configuration
• On the interface
  • The two h323-gateway commands will ensure this interface and IP is used as the source when talking H323 with CUCM even if routing causes another interface to be used to reach CUCM.

interface FastEthernet0/0
  ip address 10.1.1.101 255.255.255.0
  h323-gateway voip bind srcaddr 10.1.1.101

• Configure a timeout of 3s to stop the isdn from timing out when failing over from the subscriber to publisher

voice class h323 1
  h225 timeout tcp establish 3

• On the voip dial peer
  • incoming called-number 9T will ensure this voip dial peer is used as the incoming dial peer
• Preference: prefer lower preference

dial-peer voice 11 voip
  destination-pattern 511555....
  session target ipv4:10.1.1.1
  codec g711ulaw

• On the POTS dial peer
  • direct-inward-dial will avoid the router from providing a dial tone to PSTN caller
  • The number is forwarded directly to CUCM to route the call
  • The router/gateway does not present a dial tone to the caller and does not collect digits. It forwards the call directly to the configured destination. This is called one-stage dialing.

dial-peer voice 21 pots
  destination-pattern 9T
  direct-inward-dial
  port 0/0/0:23

• (Optional) Change the port that H.323 are listening on
• Need to restart H323 service

voice service voip
  h323
    h225 listen-port <new port>
    call service stop
    no call service stop

• Under Device > Gateway > Add New > H.323 Gateway

• Show dialpeer matching

Router# debug voip dialpeer

Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpAssociateIncomingPeerCore:
   Calling Number=2123945001, Called Number=90113432141891, Voice-Interface=0x0,
   Timeout=TRUE, Peer Encap Type=ENCAP_VOIP, Peer Search Type=PEER_TYPE_VOICE,
   Peer Info Type=DIALPEER_INFO_SPEECH
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpAssociateIncomingPeerCore:
   Result=Success(0) after DP_MATCH_INCOMING_DNIS; Incoming Dial-peer=2
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpAssociateIncomingPeerCore:
   Calling Number=2123945001, Called Number=90113432141891, Voice-Interface=0x0,
   Timeout=TRUE, Peer Encap Type=ENCAP_VOIP, Peer Search Type=PEER_TYPE_VOICE,
   Peer Info Type=DIALPEER_INFO_SPEECH
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpAssociateIncomingPeerCore:
   Result=Success(0) after DP_MATCH_INCOMING_DNIS; Incoming Dial-peer=2
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpMatchPeersCore:
   Calling Number=, Called Number=90113432141891, Peer Info Type=DIALPEER_INFO_SPEECH
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpMatchPeersCore:
   Match Rule=DP_MATCH_DEST; Called Number=90113432141891
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpMatchPeersCore:
   Result=Success(0) after DP_MATCH_DEST
Sep 24 22:08:40.659: //-1/80E92C480500/DPM/dpMatchPeersMoreArg:
   Result=SUCCESS(0) 
   List of Matched Outgoing Dial-peer(s): 
     1: Dial-peer Tag=901134 
     2: Dial-peer Tag=1

Router#

• Show active call incoming/outgoing dialpeer

Router# show call active voice brief

Telephony call-legs: 1
SIP call-legs: 0
H323 call-legs: 1
Call agent controlled call-legs: 0
SCCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2
19C9 : 996 608319968ms.1 +2510 pid:2 Answer 2123945001 active
 dur 00:00:08 tx:149/23363 rx:405/64800
 IP 192.168.100.205:24596 SRTP: off rtt:33ms pl:7030/0ms lost:0/2/0 delay:55/55/75ms g711ulaw TextRelay: off
 media inactive detected:n media contrl rcvd:n/a timestamp:n/a
 long duration call detected:n long duration call duration:n/a timestamp:n/a
19C9 : 997 608319988ms.1 +2490 pid:901134 Originate 90113432141891 active
 dur 00:00:08 tx:405/68040 rx:149/23363
 Tele 0/0/0:15 (997) [0/0/0.1] tx:10530/2920/0ms g711ulaw noise:-62 acom:37  i/0:-62/-43 dBm

Telephony call-legs: 1
SIP call-legs: 0
H323 call-legs: 1
Call agent controlled call-legs: 0
SCCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2

Router#

• Debug setup message coming from Call Manager
• Can't really read the message, but at least you can see the fields included in the message e.g.
  • Display - caller name
  • Calling Party number
  • Called Party number

Router# debug h225 q931

  Q931 Message IE Decodes
Protocol Discriminator : 0x08
CRV Length             : 2
CRV Value              : 0x0001
Message Type           : 0x05: SETUP
 Bearer Capability: Length Of IE=3
 Data 8090A2
 Display: Length Of IE=8
 Data 4875622037393731
 Calling Party Number: Length Of IE=12
 Data 008132313233393435303032
 Called Party Number: Length Of IE=15
 Data 803930313133343332313431383931
 User-User: Length Of IE=189
 Data 0520B0060008914A000501401F00480

Router#