Pages where confidential treatment has been requested are stamped Confidential Treatment Requested and the Redacted Material has been separately filed with the Commission, and places where information has been redacted have been marked with (***).

Pages where confidential treatment has been requested are stamped “Confidential Treatment Requested and the Redacted Material has been separately filed with the Commission,” and places where information has been redacted have been marked with (***).

Exhibit 10.22O

FIFTEENTH AMENDMENT

TO THE

CSG MASTER SUBSCRIBER MANAGEMENT SYSTEM AGREEMENT

BETWEEN

CSG SYSTEMS, INC.

AND

COMCAST CABLE COMMUNICATIONS MANAGEMENT, LLC

This FIFTEENTH AMENDMENT (the “Amendment”) is made by and between CSG Systems, Inc. (“CSG”) and Comcast Cable Communications Management, LLC (“Customer”). The Effective Date of this Amendment is the date last signed below.  CSG and Customer entered into a certain CSG Master Subscriber Management System Agreement (CSG document #2501940) with an effective date of March 1, 2013 (the “Agreement”) and now desire to amend the Agreement in accordance with the terms and conditions set forth in this Amendment. If the terms and conditions set forth in this Amendment shall be in conflict with the Agreement, the terms and conditions of this Amendment shall control. Any terms in initial capital letters or all capital letters used as a defined term but not defined in this Amendment shall have the meaning set forth in the Agreement. Upon execution of this Amendment by the Parties, any subsequent reference to the Agreement between the Parties shall mean the Agreement as amended by this Amendment. Except as amended by this Amendment, the terms and conditions set forth in the Agreement shall continue in full force and effect according to their terms.

CSG and Customer agree to the following:

Note 1: Design, development, implementation services, lead times and fees for the initial deployment of the QA Refresh Solution are set forth in the delivered SOW (CSG document #2505232) to be covered under ************* ***** or ****** ******* ********** ***** whichever is applicable.

Note 2: Solution Support and Maintenance will commence after the deployment of the QA Refresh Solution. The ******* Solution Support and Maintenance Fee is due to CSG ** ******* *** **** ***** the QA Refresh Solution is provided, with (i) the ***** ******* Solution Support and Maintenance Fee to be invoiced ** ** *** **** *** ** ******* ******** ** **** ********* ** *** ** ******** ** ********** **** *** QA Refresh Solution and ********* ** ******** and (ii) subsequent ******* Solution Support and Maintenance Fees to be invoiced as of the *********** **** ** *** **** **** ******* ********** ** ******** and Maintenance Fee is invoiced.  In consideration of Customer’s payment of the Solution Support and Maintenance Fee, Customer will receive ******** ******* *** *********** ** *** ***** (*) *** ************.  For clarification, CSG will invoice Customer for the period of ***** ** **** ******* ******** ** **** ** *** ******* *** ******* ***********  *** *********** can be refreshed with production configuration and up to ******-**** ******** (******) ******** *** *****.  The plan is to refresh **** ** *** ***** (*) ************ **** * *******.

Note 3:  Notwithstanding the limitation in Section 3.4(d) of the Agreement to utilize ****** ******* ********** *** *********** ******** pursuant to duly executed Statements of Work, the parties agree after **** ** **** **** ****** ******* ********** (to the extent available due to lack of use or amendment to the Agreement) may be utilized to satisfy the ******* Solution Support and Maintenance Fee due for the QA Refresh Solution.  Customer acknowledges that the use and application of ****** ******* ********** is strictly limited to satisfaction of the Solution Support and Maintenance Fee (and, if and as specified in an SOW or LOA, additional Solution Support hours) for the QA Refresh Solution, and ****** ******* ********** may not be applied against any future enhancement or changes to the QA Refresh Solution or any other Product or Service provided or performed by CSG absent an agreement duly executed by each of Customer and CSG.  For clarification, in the event the Parties amend the Agreement to no longer provide for ****** ******* **********, Customer shall pay the ******* Solution Support and Maintenance Fee as provided herein.  In the event the foregoing occurs subsequent to the date of the ***** ****** ******* ** ******* ****, Customer shall be responsible for payment of the ******* **** ** * ******** ***** **** *** ********* **** ** ** ********* ** *** ****** ******* ********** *****.

Note 4:  Provided ****** ******* ********** is available as of the invoice of the ******* Solution Support and Maintenance Fee, after **** ** **** ****** ******* ********** (as available pursuant to Section 3.4(b) of the Agreement) will be applied

Exhibit 10.22O

against and be deemed to pay the Solution Support and Maintenance Fee as of such invoice date.  In the event the ****** ******* ********** is amended during the Term of the Agreement, the current Solution Support and Maintenance Fee (subject to Note 6) will utilize **** ******** (*****) ****** ******* ********** *****.  If ****** ******* ********** is not available at the time the Solution Support and Maintenance Fee is deemed invoiced as per Note 3 above (i.e., Customer has otherwise fully utilized ****** ******* ********** amounts received by CSG for the current ******** **** as of the invoice date or the Parties have amended the Agreement removing the provision and requirements of ****** ******* **********), then Customer shall pay CSG the amount of any such shortfall.  If such shortfall occurs in any ***** ***** **** *** **** ***** of a ******** ****, the additional amount paid by Customer shall be deemed an ******* ******* ** *** **** ****** ******* ********** ******* *******, and Customer’s next ******* ****** ******* ********** payment shall be reduced by the amount of such prior *****’* ********** *******.  If, however, such shortfall occurs in the **** ***** ** * ******** ****, the additional amount paid by Customer shall be deemed a **** ******* ** ******** ** ******* ************ ** *** ******** ******* *** *********** ***, and shall not be applied against or reduce any ****** ******* ********** *** *** ******* *** *** **** ******** ****.  If as of any invoice date of the Solution Support and Maintenance Fee (and/or any overage fees per Note 3 above) ****** ******* ********** has been terminated in accordance with the Agreement, Customer agrees to pay all invoiced fees in accordance with Section 5.2 of the Agreement.  For clarification, in the event the Parties amend the Agreement to no longer provide for ****** ******* **********, Customer shall pay the ******* ******** ******* *** *********** *** as provided herein.  In the event the foregoing occurs subsequent to the date of the ***** ****** ******* ** ******* ****, Customer shall be responsible for payment of the ******* **** ** * ******** ***** **** *** ********* **** ** ** ********* ** the ****** ******* ********** *****.

Note 5:  The fees set forth in the fee table above are subject to increase pursuant to Section 5.4, Adjustment to Fees, of the Agreement.

IN WITNESS WHEREOF the parties hereto have caused this Amendment to be executed by their duly authorized representatives.