Ensure that the routers you intend to configure as H gateways are running a Cisco IOS software image.
Table of contents
- Configuring H.323 Gateways
- H Gateway Dial-Peer Configuration for Cisco CallManager Server Redundancy - Cisco
- Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2
- H.323 Gateway Dial-Peer Configuration for Cisco CallManager Server Redundancy
In this case the lower preference should be given to the subscriber because it is the Cisco CallManager server designated for call handling, while the publisher is designated to handle both the SQL database and the LDAP directory. If there is any problem with the subscriber, the call should be routed to the publisher, which can also route calls. When you set the preference order, the lower the preference number, the higher the priority. The highest priority is given to the dial peer with preference order 0 and it is the default value. You can have a preference value between 0 to Set up the dial peer that points to the primary Cisco CallManager server with a preference of 1.
In this case, the preference command takes effect because the destination patterns under the two dial peers are the same otherwise "longest match" overrides it. Set up the dial peer that points to the secondary Cisco CallManager server with a preference of 2. If this is unchecked, it causes ten to fifteen seconds of delay in the call setup. If this condition exists, you must check this value and reset the related gateway. This step is necessary because by default, the H.
Implementing H. IP Telephony. Muthurani Lavanya Paneerselvam. CUCM H. Click Next Step4: I hope the information in this blog is helpful. Back Previous Next. Abhishek Singh. Prashant Sharma. Ihsan Maranchery. Thanks alot. Latest Contents. Unity Connection SQL query that displays subscriber and exte Created by Jay Schulze on Cisco Simple Connect My Teams 2. Created by Dasaaved on Presentation from Cisco SMB webinar connect my teams. Need CUCM coverage option. Created by techvol on To ensure secure communication, H.
- H.323 Configuration Guide, Cisco IOS Release 15M&T.
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- Configuring H Gateways - Voice over IP - Cisco Certified Expert?
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- Prerequisites for Configuring H.323 Gateways.
This key is used by the gatekeeper to authenticate the source of the messages. At the endpoint level, validation is performed on all messages from the gateway. The cryptoTokens are validated using the password configured for the gateway. Note To secure the RAS messages and calls, it is essential that the gatekeeper provides authentication based on the secure key. The gatekeeper must support H. These two numbers are included in certain RAS messages sent from the endpoint to authenticate the originator of the call.
With this option, the validation of cryptoTokens in admission request ARQ messages is based on an the account number and PIN of the user who is making a call. The validation of cryptoTokens sent in all the other RAS messages is based on the password configured for the gateway.
Configuring H.323 Gateways
The cryptoTokens include the gateway identification ID —which is the H. Although the scenarios in this document describe how to use the security and accounting features in a prepaid call environment, these features may also be used to authorize IP calls that originate in another domain inter-service provider or inter-company calls. The gateway can be configured to use the gatekeeper for call authentication or authorization, and AAA can be used for call accounting. In addition, the H. Note The H.
The security features allow control access through the use of a userID-password database. The accounting enhancements allow call usage to be tracked at the origin and at the destination. These fields allow the gateway to report call-usage information to the gatekeeper. The call-usage information is included in the DRQ message that is sent when the call is terminated.
H Gateway Dial-Peer Configuration for Cisco CallManager Server Redundancy - Cisco
With prepaid calling services, an account number and PIN must be entered and the duration of the call must be tracked against the remaining credit of the customer. Note Because the authentication information includes a time stamp, it is important that all the Cisco H. Flow for a Call That Requires H. In this example, Telephone A is attempting to establish a phone call to Telephone B.
The following numbered explanations correspond to the action taking place at each numbered reference in Figure 1. If the values for the H. This prompts the gateway to resend the GRQ. The RRQ message includes authentication information in the cryptoToken field. Gatekeepers A and B respond to their respective gateways with registration confirmation RCF messages.
If an authentication failure occurs, the gatekeeper responds with a registration rejection RRJ message. Telephone A establishes a connection with Gateway A. Gateway A initiates the interactive voice response IVR script to obtain the account number and PIN of the user as well as the desired destination telephone number. The gateway must include additional information in the ARQ message to enable the gatekeeper to authenticate the call.
The information included in the ARQ message varies depending on whether the ARQ message is being sent by the source or the destination gateway. At this point in the scenario, it is the source gateway that is requesting admission. This information is encrypted using MD5 hashing and is included in the cryptoTokens field.
Gatekeeper A validates the authentication information, resolves the destination telephone number, and determines the appropriate destination gateway which is Gateway B in this case. The ACF message includes the billing information of the user such as a reference ID and current account balance for prepaid call services and an access token.
Gateway A sends a setup message to Gateway B. The setup message also includes the access token. Gatekeeper B validates the authentication information in the access token and responds to Gateway B with an ACF message. If the authentication information is in error, Gatekeeper B sends an admission rejection ARJ message to Gateway B with a reject reason of securityDenial.
Gateway B initiates a call to the destination telephone.
When the destination telephone is answered, Gateway B sends a connect message to Gateway A. Gateways A and B start their timers to meter the call. If the caller is using prepaid call services, the meter is constantly compared to the account balance of the user, which was included in the ACF message sent in Step 9.
The call is terminated when one of the parties hangs up or, in the case of prepaid call services, when either of the gateways determines that the account balance of the user has been exceeded. The DRQ message contains the resulting billing information. This information is provided to an H.
The message such as, "You have only 3 minutes remaining on your credit. The called party hears silence during this time. For example, if the configured time-out value is 3 minutes, the message is played when the caller has only 3 minutes of credit left. The message such as, "Sorry, you have run out of credit. For making subsequent calls, the caller needs to enter only the destination number. After completing a call to one destination, the caller can disconnect the call by pressing the pound key on the keypad and holding it down from 1 to 2 seconds.
If the key is pressed down for more than 1 second, it is treated as a long pound. The called party is disconnected, and the caller is prompted to enter a new destination number. Once a new destination number is entered, the call is authenticated and authorized using this number and the previously provided account number and PIN. This feature also allows the caller to continue making additional calls if the called party hangs up. Each time a caller enters a new destination number, the TCL script reauthenticates or authorizes the call with the gatekeeper and, if the caller is using a debit card account, obtains the remaining credit time information.
The TCL script will stop playing or will not begin playing the prompt if it detects that the caller wants to enter the information without listening to the prompt. Note The normal terminating character for the account number, PIN, and destination number is the pound key. This TCL script stops playing announcements when the system detects that the caller has pressed any touch tone key. The caller can use the asterisk key to cancel an entry and then reenter the account number, PIN, or destination number. The caller is allowed to re-enter a field only a certain number of times.
The number of retries may be configured. The default is three times. This means that the caller can type all the digits without the terminating character and the script determines how to extract different fields from the number strings. If the caller uses the terminating character, the terminating character takes precedence and the fields are extracted accordingly.
The IVR script supports two languages, which must be similar in syntax. The languages must be similar in the manner in which numbers are constructed—especially for currency, amount, and time. All the prompts are recorded and stored in both languages. The language selection is made when the caller presses a predefined key in response to a prompt such as, "For English, press 1. For Spanish, press 2. The TCL script uses the selected language until the caller disconnects. It prompts the caller for an account number followed by a PIN. The caller is then prompted for a destination number.
This information is provided to the H. This script provides prompts only in English. If the caller is using a debit account number, it plays a "time running out" message when the caller has 10 seconds of credit time remaining. It also plays a "time has expired" message when the credit of the caller has been exhausted. The URL to this site is as follows:. To enable security on the gateway, use the following commands beginning in global configuration mode:. Router config gateway. The gateway prompts the user for an account number and PIN. These two numbers are sent from the endpoint and are used to authenticate the originator of the call.
Specifies that validation be performed on all RAS messages sent by the gateway. The validation of cryptoTokens in ARQ messages is based on the account number and PIN of the user making the call, and the validation of cryptoTokens sent in all other RAS messages is based on the password configured for the gateway. Router config-gateway exit. Router config dial-peer voice tag pots.
Enters the dial-peer configuration mode to configure a POTS dial peer. The tag value of the dial-peer voice POTS command uniquely identifies the dial peer. Specifies the E. For an explanation of the keywords and arguments, see Step 2 of the configuration table in the "Configuring Gateway RAS" section.
Router config-dial-peer port controller number: Note The syntax of the port command is specific to Cisco hardware platforms. For information on how to configure this command for a specific device, refer to the port command documentation in the Cisco IOS Voice, Video, and Fax Command Reference. To display the security password and level when it is enabled, use the show running-config command.
By default, security is disabled. An alternate gatekeeper provides redundancy for a gateway in a system in which gatekeepers are used. A gateway may use up to two alternate gatekeepers as a backup in the case of a primary gatekeeper failure. A gatekeeper manages H. The gatekeeper provides logic variables for proxies or gateways in a call path to provide connectivity with the Public Switched Telephone Network PSTN , to improve quality of service QoS , and to enforce security policies.
Multiple gatekeepers may be configured to communicate with one another, either by integrating their addressing into the DNS or by using Cisco IOS configuration options. This feature does not include commands to allow tuning of these parameters. With gatekeeper clustering there is the potential that bandwidth may be overcommitted in a cluster.
For example, suppose that there are five gatekeepers in a cluster and that they share 10 Mbps of bandwidth.
Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2
Suppose that the endpoints registered to those alternates start placing calls quickly. It is possible that within a few seconds, each gatekeeper could be allocating 3 Mbps of bandwidth if the endpoints on each of the gatekeepers request that much bandwidth. The net result is that the bandwidth consumed in the cluster is 15 Mbps.
The alternate gatekeeper was purposely designed to restrict bandwidth because there is no clear way to sync bandwidth information quickly and efficiently. To work around this problem, "announcement" messages were restricted to intervals as small as 10 seconds. If the gatekeepers get into a situation in which endpoints request bandwidth rapidly, the problem will be discovered and corrective action will take place within at least 10 seconds.
Assuming that the gatekeepers are probably not all synchronized on their timers, the announcement messages from the various gatekeepers are likely to be heard more quickly. Therefore, the problem will be less severe. The potential exists, however, for overcommitment of the bandwidth between announcement messages if the call volume increases substantially in a short amount of time as small as 10 seconds. Note If you monitor your bandwidth, it is recommended that you consider lowering the maximum bandwidth so that if "spikes" such as those described above do occur, some bandwidth will still be available.
To configure alternate gatekeeper support on a gateway, use the following commands beginning in global configuration mode:. To identify the alternate gatekeeper, use the following keywords and arguments:.
H.323 Gateway Dial-Peer Configuration for Cisco CallManager Server Redundancy
This value must exactly match the gatekeeper identification ID in the gatekeeper configuration. Identifies the H. To see that there is an alternate gatekeeper configured, enter the show gate command. Dual tone multifrequency DTMF is the tone generated on a touch-tone phone when the keypad digits are pressed. During a call, DTMF may be entered to access interactive voice response IVR systems, such as voice mail and automated banking services. As a result, IVR systems may not correctly recognize the tones. To configure DTMF relay on a gateway, use the following commands beginning in global configuration mode:.
Router config dial-peer voice tag voip. Use this keyword to configure DTMF relay. Router config-dial-peer dtmf-relay [ cisco-rtp ] [ halphanumeric ] [ hsignal ]. This is the default codec. Specifies the prefix, the full E. For an explanation of the keywords and arguments, see Step 2 of the configuration task table in the "Configuring Gateway RAS" section.
Specifies a network-specific address for a specified dial peer or destination gatekeeper. Valid entries for this parameter are characters representing the name of the host device. Optional You can use one of the following four wildcards with this keyword when defining the session target for VoIP peers:. This is applicable for VoIP peers.
This is applicable for POTS peers. In addition to the above, the following keywords and arguments apply to the Cisco AS universal access server:. A "hookflash" indication is a brief on-hook condition during a call. The indication is not long enough in duration to be interpreted as a signal to disconnect the call. PBXs and telephone switches are frequently programmed to intercept hookflash indications and use them as a way to allow a user to invoke supplemental services.