Hello Ratanla,

please allow me to address your question in the 2 ways:

1.- Are you looking to dial a secondary number to get out via the PSTN  and use a particular FXO or Bri port?

Cisco voice-enabled routers support two types of dial peers:
   1.1  POTS dial peers: Connect to a traditional telephony network, such as the public switched telephone network (PSTN) or a PBX, or to a telephony edge device, such as a telephone or  fax machine. POTS dial peers perform these functions:
      1.1.1 Provide an address (telephone number or range of numbers) for the edge network or device
      1.1.2 Point to the specific voice port that connects the edge network or device
  1.2  VoIP dial peers: Connect over a packet network. VoIP dial peers perform these functions:
      1.2.1 Provide a destination address (telephone number or range of numbers) for the edge device that is located across the network
      1.2.3  Associate the destination address with the next-hop router or destination router, depending on the technology used

Example:

dial-peer voice 1 pots
destination-pattern 555….
prefix 555
port 1/0/0

please for more information refer to the following link https://www.myciscocommunity.com/servlet/JiveServlet/previewBody/1769-102-2-2587/UC500-CCA-First-Look-v1.3-AppendixD.pdf;jsessionid=4BB45EB6B58BD4F29135C7D60206C252

but before doing any configuration via CLI, refer to the OOB Giude,  so the  configuration done can be recognized and read in by CCA https://supportforums.cisco.com/docs/DOC-9809

2.- Are you looking to eliminate the manual process of making calls?

IPcelerate offers a suite of business operations applications, IPSmartSuite, that turn the phone into more than just a voice device, allowing users to run applications on the phone for purposes such as clocking in and clocking out for a work shift, updating waiting room status, and transmitting employee alerts. IPcelerate will offer a standard small-office set of applications along with applications that are initially vertically focused toward:

Healthcare - http://www.ipcelerate.com/assets/docs/ipss-CustomerProfileQuestionnaire-healthcare.pdf
Legal - http://www.ipcelerate.com/assets/docs/ipss-CustomerProfileQuestionnaire-legal.pdf
Office - http://www.ipcelerate.com/assets/docs/ipss-CustomerProfileQuestionnaire-office.pdf
Retail - http://www.ipcelerate.com/assets/docs/ipss-CustomerProfileQuestionnaire-retail.pdf

please for more information refer to the following link https://www.myciscocommunity.com/docs/DOC-7677

Thank you

Victor.-