Phones, (either analogue or digial) that interface via the ISDN (BRI or PRI) have the ability to make calls to PSTN telephones. Rightly or wrongly, Austel require all ISDN products with telephones (digital or POTS via ISDN) to comply with Austel TS004 for voice frequency performance, along with safety to TS001, EMI & TS013 or TS014 of course.
We can test to TS013 BRI part B (layer 1), which calls up TS004. Martin Garwood [email protected] Courtesy of RCIC http://uc.com/compliance_engineering/
