PRINCIPAL CLIENTS

6 Months Ended

Jun. 30, 2015

The following table represents revenue concentration of our principal clients:



	Three Months Ended June 30,								Six Months Ended June 30,
	2015				2014				2015				2014
	Revenue		Percentage		Revenue		Percentage		Revenue		Percentage		Revenue		Percentage
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom (2)	$	17,033	26.8	%	$	18,785	30.7	%	$	35,123	27.6	%	$	37,424	30.1	%
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T, Inc. (1)	$	8,070	12.7	%	$	13,753	22.5	%	$	18,810	14.8	%	$	29,097	23.4	%
Comcast Cable Communications Management, LLC, subsidiary of Comcast Corporation (2)	$	7,930	12.5	%	$	10,777	17.6	%	$	16,809	13.2	%	$	21,737	17.5	%

(1) Revenue from this customer is generated through our Domestic and Offshore segments.

(2) Revenue from this customer is generated through our Domestic and Offshore segments in 2014 and 2015 and through our Nearshore segment in 2014.

We enter into contracts and perform services with our major clients that fall under the scope of master service agreements (MSAs) with statements of work (SOWs) specific to each line of business. These MSAs and SOWs may automatically renew or be extended by mutual agreement and are generally terminable by the customer or us with prior written notice.

On July 28, 2011, we entered into a new MSA with T-Mobile effective July 1, 2011, which has an initial term of five years and will automatically renew for additional one-year periods thereafter, but may be terminated by T-Mobile upon 90 days written notice.

On January 25, 2013, we entered into a new MSA with AT&T Services, Inc., which expires December 31, 2015 and may be extended upon mutual agreement, but may be terminated by AT&T with written notice.

On January 4, 2014, we entered into a new MSA with Comcast, effective June 22, 2013. The new MSA had an initial term of one year and will automatically renew for additional one-year periods unless either party gives notice of cancellation. Neither party gave notice of termination; therefore, the contract has renewed for the year ending June 22, 2016, but Comcast may terminate the agreement upon 90 days written notice.