Concentrations of Credit Risk, Major Customers, Major Suppliers and Geographic Information (Details) (Textual) (USD $)	12 Months Ended
	Jul. 31, 2012 Suppliers Distributors	Jul. 31, 2011
Concentrations of Credit Risk, Major Customers, Major Suppliers and Geographic Information (Textual) [Abstract]
Revenue from the United States federal government	$ 407,000	$ 735,000
Percentage of total revenue of United States federal government	2.00%	3.00%
Revenue from four major distributors of Cortelco	10,105,000	9,285,000
Percentage revenue of Cortelco	45.00%	40.00%
Number of major distributors	4
Percentage revenue of distributors	16.00%	17.00%
Revenue from distributors	3,518,000	3,950,000
Receivables	1,604,000	2,110,000
Receivables from the federal government	185,000	35,000
Trade accounts receivable	21.00%	27.00%
Purchases of company	42.00%
Number of major suppliers	2
Total purchases	3,441,000	5,272,000
Balances payable	$ 227,000	$ 1,364,000