Trying to access numbers in the dialling plan, other than an extension gives a invalid tone
for example unable to dial *545 *546 *547 (External Paging, one of which should be on the MP card
also trying to test the Modem by dialling 227, also gives invalid tone
for example unable to dial *545 *546 *547 (External Paging, one of which should be on the MP card
also trying to test the Modem by dialling 227, also gives invalid tone