Troubleshooting One common issue with PRI on ESI’s PRI-compatible systems is the failure of incoming or outgoing calls over PRI to connect or display Caller ID. The following discussion, derived from Technical Update 164 (ESI # 0450-0462, downloadable from www.esiresellers.com/tech), discusses methods to address this: 1. ESI has found that many PRI circuits have been set in Function 2134 to a switch protocol that’s incompatible with the PRI provider. ESI recommends that, regardless of the make and model of the CO or IXC switch that’s providing the PRI, you first set the default switch protocol (NI2). If the PRI doesn’t function properly using the NI2 protocol, then select the appropriate switch option for the make and model of the provider’s equipment. Note: Always complete programming in any function before exiting programming mode (# through all of the Function parameters). 2. ESI has also determined that, after you change the PRI switch protocol programming, you also MUST power-cycle the system in order to correctly synchronize the PRI with the service provider’s switch. Important: Before power-cycling the system, wait at least four (4) full minutes after you complete programming. After power-cycling the system, wait until the appropriate DLC is on-line — i.e., its Status LED is no longer flashing. Note the time when the PRI came on-line. Make several outgoing and incoming calls via the PRI to insure that it’s working properly. If the PRI appears to be functioning properly, contact the carrier and verify that no errors have occurred since the time when the PRI came on-line. If the carrier reports errors or if incoming or outgoing calls aren’t functioning properly, select a different switch option in Function 2134 and power-cycle the system again (and then, again, wait at least four full minutes before exiting programming). 3. Set Function 166, parameter 2 (ARS inter-digit timer) to between 500 and 600 (i.e., between five and six seconds). This will set the timeout that occurs after the first digit has been dialed when making an outgoing call over the PRI, so that it’s long enough to allow the entire entered number to be accepted. The ARS inter-digit timer value is expressed in 1/100 seconds. Range: 40–1,000 (i.e., 400 ms to 10 seconds). 4. Contact ESI Technical Support at 800 491-3609 and request that the PRI error counters be cleared.