© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring PSTN Interfaces and Voice Dial Peers Analog and Digital Voice Interfaces

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Outline Overview Local-Loop Connections Analog Voice Interfaces Channel Associated Signaling Systems: T1 Channel Associated Signaling Systems: E1 Common-Channel Signaling Systems PRI and BRI QSIG Summary

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Local-Loop Connections

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v FXS Interface Connects directly to analog phones or faxes Used to provision local service Provides power, call progress tones, and dial tone FXS

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v FXO Interface Connects directly to office equipment Used to make and receive calls from the PSTN Can be used to connect through the PSTN to another site Answers inbound calls PSTN FXO

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v E&M Interface Connects two sites together with a leased connection Allows for the use of non-PSTN numbers Used to create tie-lines Commonly used to connect to external Music on Hold sources E&M Tie-Line E&M MOH

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Channel Associated Signaling Systems

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Characteristics of a CAS T1 Up to 24 channels for voice Each channel is a DS samples per second 1 byte per sample Partial T1 may be available Signaling travels in-band CAS T1 PSTN

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Channel Associated Signaling Systems: E1

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Characteristics of a CAS E1 Up to 30 channels for voice Each channel is a DS samples per second 1 byte per sample Partial E1 may be available Signaling is carried out-of-band CAS E1 PSTN

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Common-Channel Signaling

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v ISDN PRI and BRI Allows for a multiple services through one connection Well-adapted for voice –64-kbps channels –Q.931 on the D channel Supports standards-based functions Supports proprietary implementations International utilization PRI 23B+D BRI 2B+D Carrier

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Summary Analog interfaces can be used to connect analog devices and to connect to the PSTN. Cisco CallManager Express can use T1 circuits to convey voice. Cisco CallManager Express can use E1 circuits to convey voice. Examples of CCS are proprietary implementations, ISDN, DPNSS, and QSIG. ISDN can be implemented in two different ways: BRI and PRI.