User manual
Impedance: 600 and 800 Ohm
Off hook loop DC current: 10, 20 and 32mA
Ring Frequency: 16 to 75Hz
Ring Voltage: 30 to 55 VRMS
4.5.16 Line Impairments
Line impairments allow software developers and QA testers to simulate real world conditions
On telephone lines such as noise, delays or echo.
Delays can be congured for Transmit and Receive path separately for up to 2000 ms.
Noise is a White Gaussian distribution noise. Echo can be congured for up to 2000ms
5. Chapter 5: Chapter 5: Using CLASS or PBX Features
5.1 Call hold
When you need to place a remote party on hold, you can do so by pressing a “Flash” button
on your telephone. After pressing a “Flash” button you will hear a secondary (stuttered) dialtone which will
allow you to make another call while a rst party is still on hold.
After you nished and would like to revert to a holding party you need to put your handset
on hook and wait till you hear a ring. After you pick up handset you will be connected back to
a party that was on hold.
5.2 Three-way-calling
To use a there-way-calling, follow this procedure:
Call a rst party by dialing its phone number
After rst party has answered a call, press the Flash button on your telephone
This will place a rst party on hold and you will hear a secondary (stuttered) dial tone
Once you have a secondary dial tone, dial a second party’s telephone number
After a second party has answered a call, press again the Flash button on your telephone
This will interconnect two calls into a three-way calling conference
6. Chapter 6: Optional T1/E1/PRI module
6.1 Overview of T1/E1/PRI module
Optional T1/E1/PRI module support switching audio/video or data calls among ant B-channels or FXS
ports.
With a module installed you can place a call from any of the analog telephones to any of the PRI B-
channels by dialing a one of the 30 phone numbers congured for each of the PRI ports and vise versa.
T1/E1/PRI module supports PRI call switching over T1 or E1 and supports following PRI switch types:
National NI-2, 5ESS, DMS-100, NET3 and Q.SIG
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User Manual
Public Switched Telephone Network (PSTN) Simulators