Cisco Unified Border Element Protocol-Independent Features and Setup Configuration Guide, Cisco IOS Release 12.4T
SIP SRTP Fallback to Nonsecure RTP
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SIP SRTP Fallback to Nonsecure RTP

SIP SRTP Fallback to Nonsecure RTP

Last Updated: December 20, 2011

The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from Secure Real-time Transport Protocol (SRTP) to Real-time Transport Protocol (RTP) by accepting or sending an RTP/Audio-Video Profile(AVP) (RTP) profile in response to an RTP/SAVP (SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure Transport Layer Security (TLS), IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for SIP SRTP Fallback to Nonsecure RTP

Cisco Unified Border Element

  • Cisco IOS Release 12.4(22)T or a later release must be installed and running on your Cisco Unified Border Element.

Cisco Unified Border Element (Enterprise)

  • Cisco IOS XE Release 3.1S or a later release must be installed and running on your Cisco ASR 1000 Series Router.

Configuring SIP SRTP Fallback to Nonsecure RTP

To enable this feature, see the "Configuring SIP Support for SRTP" section of the Cisco IOS SIP Configuration Guide, Release 15.1 at the following URL: http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-srtp_ps10592_TSD_Products_Configuration_Guide_Chapter.html

Detailed command information for the srtp, srtp negotiate, and voice-class sip srtp negotiatecommands is located in the Cisco IOS Voice Command Reference http://www.cisco.com/en/US/docs/ios/voice/command/reference/vr_book.html

Feature Information for SIP SRTP Fallback to Nonsecure RTP

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Feature History Table entry for the Cisco Unified Border Element.

Table 1 Feature Information for SIP SRTP Fallback to Nonsecure RTP

Feature Name

Releases

Feature Information

SIP SRTP Fallback to Nonsecure RTP

12.4(22)T

The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from SRTP to RTP by accepting or sending an RTP/AVP(RTP) profile in response to an RTP/SAVP(SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure TLS, IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes.

The following commands were introduced or modified: srtp (voice), srtp negotiate, and voice-class sip srtp negotiate

Feature History Table entry for the Cisco Unified Border Element (Enterprise).

Table 2 Feature Information for SIP SRTP Fallback to Nonsecure RTP

Feature Name

Releases

Feature Information

SIP SRTP Fallback to Nonsecure RTP

Cisco IOS XE Release 3.1S

The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from SRTP to RTP by accepting or sending an RTP/AVP(RTP) profile in response to an RTP/SAVP(SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure TLS, IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes.

The following commands were introduced or modified: srtp (voice), srtp negotiate, and voice-class sip srtp negotiate

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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