Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
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Chapter 7 Cisco IGX 8400 Series Voice Service
Voice Service—Functional Overview
Signaling on the CVM
The CVM extracts signaling information from the signaling bits in an E1, T1, or J1 frame. When a
signaling bit changes state, the CVM or UVM generates signaling packets for the CVM at the other end
of the connection.
You can configure voice-channel signaling of any of the following types on the CVM:
• Robbed-bit signaling (either D4 or ESF frame format) for T1 lines
• Channel-associated signaling (CAS) for E1 or J1 lines
• Transparent CCS (ISDN & DPNSS) for all lines
• E&M-to-DC5A and DC5A-to-E&M conversion for international applications
The CVM supports both CAS and CSS signaling. However, CSS (such as DPNSS and ISDN signaling)
is supported through a clear (transparent) channel. See Table 7-2 for signaling formats supported on the
UVM.
Tip For CSS on an E1 line, configure channel 16 as a t-type connection to carry the signaling.
The CVM extracts CAS signaling information from the signaling bits in the E1 or T1 frame. When a
signaling bit changes state, the CVM generates signaling packets to the CVM or UVM at the other end
of the connection. You can select any one of many voice-interface types, such as 2-W E&M, FXO/FXS,
or DPO/DPS, from a template to condition the VF signaling. You can also specify customized signal
conditioning.
Signaling on the URM
The URM offers a full suite of IP services, including VoIP, and end-to-end operability with any
Cisco IOS-based platform. It extracts information from the CAS signaling bits in the T1 or E1 frame.
When a signaling bit changes state, the URM sends signaling packets to the card at the other end of the
connection. CSS signaling, such as DPNSS and ISDN signaling, are supported through a clear
(transparent) channel.
You can configure voice channel signaling of any of the following types on the URM:
• CAS: telephony interface signaling T1 CAS, transparent CAS signaling
• CCS: Q.Sig T1/E1, Q.921, ISDN PRI (user side), CCS-DPNSS, transparent (IP and ATM)
Table 7-3 Signaling Formats Supported on the CVM
Line Type Line Framing Signaling Format Signaling Bit
T1 ESF CAS ABAB
T1 ESF CAS ABCD
T1 D4 CAS AB
T1 – CSS –
E1 – CAS ABCD
E1 – CSS –