Cisco Systems ASR 1000 Local Source Properties Address and Port, Locally Hairpinned Sessions

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Chapter 7 H.248 Services—Signaling and Control

Local Source Properties (Address and Port)

DBE Restrictions

The following are restrictions of DBE support for the Flexible Address Prefix Provisioning feature:

•Only three different lengths of network masks can be in use on a given shared address at one time.

•When multiple mask lengths are used on a shared local address, there is extra overhead of hash key construction and flow entry lookup.

Local Source Properties (Address and Port)

The Local Source Properties (Address and Port) feature is described in the “Local Source Properties (Address and Port)” section on page 8-4.

Locally Hairpinned Sessions

The DBE supports hairpinning of calls between subscribers connected to the same DBE for IPv4 and IPv6 packets. A hairpin consists of two pinholes or two pairs of terminations on the DBE that the media gateway controller (MGC) has provisioned with local and remote addresses whereby media from one pinhole should travel directly (loops back) to the other pinhole. The MGC (also known as an SBE) does not differentiate whether Add requests are sent to the same or different DBEs for a flow setup.

In a hairpin media call flow setup, two pairs of terminations internally connect the backbone (BB) side to logically merge two separate DBEs into one DBE. The flow resembles a hairpin.

This feature is useful for interoperation with signaling border elements (SBEs) that provision two pinholes, even in the case where the SBE does not require media to be sent further into the network.

Note Pinhole is an informal term for a pair of terminations in the same stream and same context.

Twice NAPT Pinhole Hairpinning

The DBE successfully forwards media through Twice Network Address and Port Translation (NAPT) pinholes that form a hairpin. For Twice NAPT hairpinning, the DBE forwards media on demand. The SBE sees no differences between Twice NAPT hairpins and Twice NAPT non-hairpins.

When forwarding media, a hairpin behaves the way two separate pinholes behave, except that a packet going through a coupled pair has its IP Time-to-Live counter decremented only once, not twice.

Note Twice NAPT is only supported on IPv4.

No NAPT Pinhole Hairpinning

No NAPT pinholes can form hairpins only under the following circumstances:

•Both pinholes are No NAPT.

Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers

 

OL-15421-01

7-5

 

 

 

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Contents Americas Headquarters Page Iii N T E N T SQoS Bandwidth Allocation Traffic Management Package Support Local Source Properties Address and Port Vii IPv6 SupportEvents Storage Until Event Acknowledgment Document Revision History PrefaceObjectives OL-15421-01 May 5 This document was first publishedOrganization Intended AudienceDocument Conventions Related DocumentationCisco ASR 1000 Series Router Documentation Cisco IOS Release 12.2SR Software PublicationsXii Xiii Obtaining Documentation and Submitting a Service RequestXiv Contents Cisco ASR 1000 Series Routers OverviewGeneral Overview Example of SBC High Level Architecture Distributed and Unified ModelsOn page 1-3illustrates the unified model Release Feature Name Related SBC Commands Documented Supported Integrated Session Border Controller FeaturesPackage segment Cisco IOS Cisco IOS Logging Level in ConfiguringNone XE ReleaseMedia-address ipv4 Deployment of the Integrated Session Border Controller Transaction-pending commandIntegrated SBC Used for VoIP Interworking Integrated Session Border Controller DBE Deployment Scenario Configuring Integrated Session Border Controller Prerequisites for Integrated Session Border ControllerRestrictions for Integrated Session Border Controller Summary Steps PrerequisitesEnter your password if prompted Enables privileged Exec modeEnters global configuration mode Enters into interface configuration modeOwn address when connecting to the SBE Configures the DBE to use a specific IPv4 H.248 controlConfigures the H.248 controller for the DBE and enters into Controller H.248 configuration modeTroubleshooting Tips What To Do NextExamples Configuring H.248 Logging Level SBC-DBE configuration mode Creates the DBE service on the SBC and enters intoSets a specified logging level to generate detailed logs Messages sent and received. Turns on consoleEnabling H.248 Logging Requests and Responses Configuration Examples This section provides the following configuration examplesExample H.248 Log Output SBC DBE Configuration Steps Example Making Global Changes to Controllers Example == Make change to local port Following example shows the initial SBC configurationControl-address h248 ipv4 172.25.2.26 controller h248 Making Changes to Individual Controller Settings ExampleIeps Indicator Yes Topology Priority Indicator Yes Emergency IndicatorCisco H.248 Profile Overview of ProfilePackage ID Version Profile PackagesPackage ID Version Support Dependent On Information About Dtmf Interworking Dtmf InterworkingConfiguring Default Duration of a Dtmf Event RTP to SIP InterworkingSIP to RTP Interworking Configuration mode. Use the sbc-name argument to specify Enters the mode of a DBE service and enters into SBC-DBEName of the DBE service Configures the default duration of a Dtmf eventPage Restrictions for Configuring Media Address Pools Media Address PoolsPrerequisites for Implementing Media Address Pools Information About Media Address Pools Configuring Media Address PoolsEnters into SBC-DBE configuration mode Is configuredConfiguration mode Creates a port range for the configured mediaConfiguring Media Address Pools Example Traffic Management Package Support Quality of Service and Bandwidth ManagementPage Dscp Marking and IP Precedence Marking Dscp Re-MarkingsParameters on AC and per SDP on Rtcp Policing Not Using Tman Package Rtcp Policing Using Tman PackageQoS Bandwidth Allocation Rtcp PolicingTwo-Rate Three-Color Policing and Marking Enabling Two-Rate Three-Color Policing and MarkingImplementing Two-Rate Three-Color Policing and Marking DBE Restrictions Related Commands Page Enabling Optional H.248 Packages Packages-Signaling and ControlSegmentation Package Support Address Reporting PackageSession Failure Reaction Package Termination State Control Package Tsc-quiesce FeatureTsc-suspend Feature Vlan Package Syntax-Level Support 248.1v3 SupportMGC-Controlled Gateway-Wide Properties Page Services-Signaling and Control DBE Signaling Pinhole Support Extension to H.248 Termination Wildcarding Support Extension to H.248 Audit SupportFlexible Address Prefix Provisioning Locally Hairpinned Sessions Local Source Properties Address and PortTwice Napt Pinhole Hairpinning No Napt Pinhole HairpinningMGC-Specified Local Addresses or Ports Multi-Stream Terminations Nine-Tier Termination Name HierarchyRestrictions for Nine-Tier Termination Name Hierarchy Displaying the Nine-Tier Termination Name Hierarchy Information About Nine-Tier Termination Name HierarchyAbc/voice/gn/0/1/0/1/ac/3 Displaying the Nine-Tier Termination Name Hierarchy ExampleOptional Local and Remote Descriptors ServiceChange Notification for Interface Status Change Remote Source Address Mask FilteringRTP Specific Behavior Support Sbc interface-id value End Configuration Example Output Tsc-Delay Timer MAX TimerTmax-timercommand configures the value of the T-MAX timer Video on Demand VOD SupportServices-Signaling and Control Video on Demand VOD Support Services-Signaling and Control Video on Demand VOD Support Integrated Session Border Controller Security Firewall Media Pinhole Control Latch and Relatch Support Interim Authentication Header SupportLocal Source Properties Address and Port Etsi TS 102 333 version 1.1.2 Gate Management Package Napt and NAT TraversalTraffic Management Policing Topology HidingTopology Hiding IPv6 Inter-Subscriber Blocking IPv4 Twice NaptRouter# show run interface gigabitEthernet 0/1.1101 QoS Policy-Map-Based Inter-Subscriber Blocking MethodRouter# show class-map IPv6intersubscriber ACL-Based Inter-Subscriber Blocking Method IPv6 SupportIPv6 No Napt Support for Media Flows IPv6 PinholesSend Recv IPv6 Single Napt for SignalingSingle Napt Signaling Flow No Napt Pinholes Topology Hiding No Napt Pinholes High Availability Support Integrated Session Border Controller High Availability10-1 Software Redundancy Hardware RedundancyRoute Processor Redundancy RPR 10-2SSO Support Issu Support10-3 High Availability Support Issu Support 10-411-1 Quality Monitoring and Statistics GatheringBilling and Call Detail Records Congestion-threshold CommandDBE Status Notification Enhanced Event Notification and Auditing11-3 Retention and Returning of H.248 Event InformationResetting the Media Timeout Timers Association ResetSilent Gate Deletion 11-4Middlebox Pinhole Timer Expired Event Network Package Quality Alert Event11-5 Provisioned Inactivity Timer Related Command11-6 IN-1 IN-2 IN-3 Policing Asymmetric policing Ipv6 packets Pinhole Pinhole timeoutRTP specific behavior support SBE IN-4IN-5 IN-6
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