技术细节
| 回路电流 |
21 mA |
| 消息等待电压 |
93 V |
| 操作特性 |
CDP MIB\nBasic MIB II (RFC 1213) \nInterface MIB (RFC 1573) \nRMON (Ethernet statistics group) \nCisco Process MIB \nCisco Memory Pool MIB \nCisco Voice Interface MIB \nCisco Analog Voice Interface MIB \nCisco EnvMon MIB |
| 环电压 |
46 V |
| 管理平台 |
DNS, Cisco CallManager 3.1 |
| 电磁兼容性 |
FCC Part 15 (CFR 47) Class A, ICES 003 Class A, CISPR22 Class A, AS/NZS 3548 Class A, VCCI Class A, EN55022 Class A, EN 55024, EN 50082-1, ETS 300 386, EN 61000-3-2, EN 61000-3-3 |
协议
| 管理协议 |
SNMP, Telnet |
| 支持的协议 |
SCCP, RTP, TFTP, FTP, HTTP, DHCP, G.711, G.729a |
认证标准
| 安全 |
UL 1950, CSA C22.2 No. 950, EN 60950, IEC 60950, AS/NZS 3260, TS 001 |
The Cisco VG248 Analog Phone Gateway is a mixed-environment solution, enabled by Cisco AVVID (Architecture for Voice, Video and Integrated Data), which allows organizations to support their legacy analog devices while taking advantage of the new opportunities afforded through the use of IP telephony. The Cisco VG248 is a high-density gateway for using analog phones, fax machines, modems, voice mail systems, and speakerphones within an enterprise voice system based on Cisco CallManager. It is advantageous to have these devices tightly integrated with the rest of the IP-based phone system, for increased manageability, scalability, and cost-effectiveness.
The Cisco VG248 offers 48 fully featured analog phone lines to be used as extensions to the Cisco CallManager system in a very compact 19-inch rack-mount chassis.
Key features:
- Analog phones—Full-feature analog phone connectivity is needed when the infrastructure (wiring) or application does not support or require IP phones. Full-featured analog phone lines allow organizations to deploy IP telephony without having to purchase IP phones for all the users.
- Fax and modem—Fax machine and modem connectivity are required in many locations for business needs, and the Cisco VG248 is the ideal device to provide the lines for them. Fax machine and modem connectivity allows organizations to support these legacy devices alongside the New World IP telephones.
- Voice mail—Many legacy voice mail systems require analog and Simple Messaging Desktop Interface (SMDI) connectivity. Voice mail support allows support for legacy voice mail systems with Cisco CallManager in more configurations and with higher reliability than was previously possible.
- Investment protection—Customers can continue to use existing phones, fax machines, and voice mail systems while taking advantage of IP telephony.
- Reduced barrier to entry—Providing a low-cost alternative for low-end analog phones, organizations can take advantage of IP telephony with a lower overall investment in this new technology.
Analog Phone Connectivity
The Cisco VG248 is ideal for implementations in which it is necessary to use analog phones because it provides a high level of functionality at those locations, including:
- Caller ID—The Cisco VG248 supports caller ID (both name and number), so users can tell who is calling before answering the phone.
- Message-waiting light—The Cisco VG248 supports two methods of analog light activation: high-DC voltage (message-waiting indicator light) and frequency-shift-key (FSK) messaging, as well as stuttered dial tone for phones without a visual indicator. These schemes are used by private branch exchange (PBX) systems and central offices, respectively.
- Call waiting—When on a call, if a new call comes in the user hears an audible tone and can "click over" to the new caller.
- Caller ID on call waiting—The user can see who is calling before deciding whether to take the new call.
- Transfer—Both blind and supervised transfers are supported, using the standard Bellcore flash hook method.
- Conference—Conference calls can be initiated from an analog phone using flash hook or feature access codes and the Cisco CallManager will direct the devices to a media resource for the conference call. Up to six parties can participate.
- Feature access codes—More advanced features can be activated using feature access codes.
- Speed dial—A user can set up commonly dialed numbers using the Cisco CallManager Web interface and then dial these numbers directly from an analog phone.
- Call forward all—Calls can be forwarded to a number within the dial plan.
- Redial—A simple last-number redial can be activated from analog phones connected to the Cisco VG248.
- Cisco SoftPhone support—Cisco SoftPhone functionality is supported with analog phones.
Fax and Modem Connectivity
The Cisco VG248 supports legacy fax machines and modems. When using fax machines, the Cisco VG248 uses the Cisco fax-relay technology to transfer faxes across the network with high reliability using less bandwidth than a voice call. Any modems can be connected to the Cisco VG248.
Voice Mail Connectivity
The Cisco VG248 generates call information in an SMDI format for all calls ringing on any of the 48 analog lines connected to it. It will also pass on SMDI from other Cisco VG248s, or from a legacy PBX to the voice mail system. Any commands for message-waiting indicators will be sent to the Cisco CallManager and to any other attached SMDI hosts.
