Supported Features; Inband Dtmf Interworking; Managing Jitters For Voice Packets - Cisco ASR 1000 Configuration Manual
Aggregation services routers sip and spa software
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Supported Features
Supported Features
The Cisco SPA-DSP for the ASR 1000 Series includes some of the following basic features:
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Inband DTMF Interworking
The Dual-Tone Multifrequency (DTMF) dialing consists of simultaneous voice-band tones generated
when a button is pressed on a telephone. The use of DTMF signaling for this feature enables support for
advanced telephony services. Currently there are a number of application servers and service creation
platforms that do not support media connections. To provide value-added services to the network, these
servers and platforms need to be aware of signaling events from a specific participant in the call. Once
the server or platform is aware of the DTMF events that are being signaled, it can use third-party call
control, or other signaling mechanisms, to provide enhanced services. Examples of the types of services
and platforms that are supported by this feature are various voice web browser services, Centrex switches
or business service platforms, calling card services, and unified message servers. All of these
applications require a method for the user to communicate with the application outside of the media
connection. The DTMF Events Through SIP Signaling feature provides this signaling capability.
This feature is related to the SIP INFO Method for DTMF Tone Generation feature, which adds support
for out-of-band DTMF tone generation using the SIP INFO method. Together the two features provide
a mechanism to both send and receive DTMF digits along the signaling path. The SPA-DSP supports the
detection and reporting of inband DTMF tones and their conversion to RFC2833 based DTMF tones or
out-of-band signalling (and vice versa).
Note
The SPA-DSP supports the conversion from RFC2833 DTMF tones to inband tones.
Managing Jitters for Voice Packets
This section explains how jitter in voice packets are managed by SPA-DSP to provide smooth flow of
voice streams. Jitter is defined as the variation in the delay of received packets. In a packet-voice
environment, the sender is expected to reliably transmit voice packets at a regular interval (for example,
send one frame every 20 ms). These voice packets can be delayed throughout the packet network and not
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
24-4
Enhances ASR 1000 Series Router capabilities by providing DSP based voice transcoding and
transrating solutions.
Translates one type of media stream (voice) to another type of media stream that uses different
media encoding and decoding technologies.
Enables translation between different packetization settings (transrating), and provides DTMF
interworking.
Provision to configure S/BC as a Unified SBC or Distributed SBC with on-board DSPs or as a
centralized DSP providing trancoding for number of external SBCs.
Faceplates LEDs to indicate SPA status.
Voltage and temperature monitoring.
Supports online insertion and removal (OIR).
Provides a jitter buffer to be able to do packet loss concealment.
Enables transcoding of voice packets for IPv4 (VoIPv4) as well as IPv6 (VoIPv6).
Chapter 24
Overview of the Cisco DSP SPA for ASR 1000 Series
OL-14127-08
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