Table Of Contents

Flexible Media Routing

Contents

Prerequisites for Configuring the Flexible Media Routing Feature

Configuring the Flexible Media Routing Feature

Configuration Examples for the Flexible Media Routing Feature

Changes in XML Billing Records

Flexible Media Routing

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The Flexible Media Routing feature supports the call legs in which media and signaling are sent over different virtual or physical networks. The signaling network is configured using the vrf command in the adjacency submode. All the call legs to and from an adjacency use the same VPN ID for signaling. The media network is configured using the vrf parameter in the media-address command.

When the Flexible Media Routing feature is enabled, the media address selection overrides the
VPN ID-based selection. Therefore, the media VPN ID is no longer compared with the signaling VPN ID. Instead, the SBC selects the media address whose realm matches the adjacency realm. The IPv6 and H.323 protocols support the Flexible Media Routing feature.

Cisco Unified Border Element (SP Edition) was formerly known as Integrated Session Border Controller and may be commonly referred to as the session border controller (SBC) in this document.

For a complete description of the commands used in this chapter, refer to the Cisco Unified Border Element (SP Edition) Command Reference: Unified Model at:

http://www.cisco.com/en/US/docs/ios/sbc/command/reference/sbcu_book.html

For information about all Cisco IOS commands, use the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or a Cisco IOS master commands list.

Feature History for Flexible Media Routing

Release	Modification
Cisco IOS XE Release 3.5S	The Flexible Media Routing feature was introduced on the Cisco ASR 1000 Series Aggregation Services Routers.

Contents

This chapter contains the following sections:

•Prerequisites for Configuring the Flexible Media Routing Feature

•Configuring the Flexible Media Routing Feature

•Configuration Examples for the Flexible Media Routing Feature

•Changes in XML Billing Records

Prerequisites for Configuring the Flexible Media Routing Feature

The following prerequisite is required to configure the Flexible Media Routing feature:

Ensure that the SBC is deactivated before configuring the Flexible Media Routing feature.

Configuring the Flexible Media Routing Feature

This task shows how to configure the Flexible Media Routing feature.

SUMMARY STEPS

1. configure terminal

2. sbc sbc-name

3. no activate

4. allow diff-med-sig-vpn

5. activate

6. exit

DETAILED STEPS

	Command or Action	Purpose
Step 1	configure terminal Example: Router# configure terminal	Enables the global configuration mode.
Step 2	sbc sbc-name Example: Router(config)# sbc test	Enters the SBC configuration mode.
Step 3	no activate Example: Router(config-sbc)# no activate	Deactivates the SBC. Note If the SBC is active and you run the allow diff-med-sig-vpn command, the system issues a warning message, asking you to first deactivate the SBC. You can reactivate the SBC using the activate command.
Step 4	allow diff-med-sig-vpn Example: Router(config-sbc)# allow diff-med-sig-vpn	Allows media and signaling to use different VPN IDs in a call leg. The no version of this command allows media and signaling to use the same VPN ID in a call leg.
Step 5	activate Example: Router(config-sbc)# activate	Reactivates the SBC.
Step 6	exit Example: Router(config-sbc)# exit	Exits the SBC configuration mode.

Configuration Examples for the Flexible Media Routing Feature

The following example shows the SBC behavior when the Flexible Media Routing feature is configured:

sbc test

allow diff-med-sig-vpn

The following example shows how to configure different VRFs under the signaling and media networks.

sbe

adjacency sip sipp1 		 ================== incoming

force-signaling-peer all

vrf vrf_sipp1

nat force-on

inherit profile preset-access

signaling-address ipv4 192.0.2.1

statistics method summary

signaling-port 5060

remote-address ipv4 192.0.2.3 255.255.255.0

signaling-peer 192.0.2.3

realm FMR

attach

adjacency sip sipp2 		 ================== outgoing

force-signaling-peer all

vrf vrf_sipp2

nat force-off

inherit profile preset-access

signaling-address ipv4 192.0.2.2

statistics method summary

signaling-port 5060

remote-address ipv4 192.0.2.4 255.255.255.0

signaling-peer 192.0.2.4

fast-register disable

realm FMR

call-policy-set 1

first-call-routing-table start-table1

first-reg-routing-table start-table1

rtg-src-adjacency-table start-table1

entry 1

match-adjacency sipp1

dst-adjacency sipp2

action complete

entry 2

match-adjacency sipp2

dst-adjacency sipp1

action complete

complete

call-policy-set default 1 

network-id 9737

!

media-address ipv4 192.0.2.5 vrf vrf_media realm FMR

port-range 16384 32767 any

activate

!

end

Changes in XML Billing Records

After the Flexible Media Routing feature is enabled, the SBC adds the mediarealm attribute to the adjacency element in the XML billing records as follows:

<adjacency type="orig" name="Adj1" account="Acc1" vpn="0X12345678" mediarealm="Internet"/>

For more information about the mediarealm attribute, see Appendix C, XML Billing Schema.