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Cisco IOS Voice Port Feature List
Table 1 lists voice port features by Cisco IOS release. Features that are introduced in a particular release are available in that and subsequent releases.
Table 1 Voice Port Features by Cisco IOS Release
Software-Configurable 128-ms Echo Cancellation
Beginning in Release 12.4(20)T, software-configurable echo cancellation coverage was expanded to include 80, 96, 112, and 128 milliseconds. The default is changed from 64 ms to 128 ms.
Beginning in Release 12.4(15)XZ, the Cisco 880 broadband series routers integrate access technologies such as the VDSL2, 3G; adds voice for service provider-managed services and for enterprise teleworkers. In addition, the broadband series routers offer UTM features such as URL filtering and optional IEEE 802.11n integrated access points that can be managed using LWAPP.
NextPort-Based Voice-Tuning and Dual-Filter G.168 Echo Canceller
NextPort dual-filter G.168 echo canceller (EC) improves voice quality in VoIP connections by providing relatively less residual echo leakage, better nonlinear processing (NLP) timing, less clipping, and better comfort noise generation (CNG) in most environments.
IP Communications High-Density Digital Voice/Fax Network Module
This feature supports high-density digital voice and low-density analog voice connectivity along with data and integrated access connectivity. The network modules offer built-in T1/E1 ports, and include a single VIC/voice WAN interface card (VWIC) slot for FXS, FXO, E&M, software-configured CAMA, DID, BRI, or E1 and T1 cards, up to a maximum of four T1/E1 ports. The network modules also support up to 32 HDLC channels with an aggregate capacity of 2.048 Mbps.
This feature offers improved standards for echo cancellation performance. Configurable tail length is increased, up to 64 ms. Minimum ERL is configurable to greater than or equal to 0 dB, 3 dB, or 6 dB. Echo suppression is no longer needed because of faster convergence.
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