WCP-344 : Added validation of telephony utilizing annotation based validation.

Tooltips for formats:
![image](https://f.cloud.github.com/assets/3534544/2346366/4be5d9ba-a541-11e3-8ed5-51c0912a5447.png)

Error on required Fields:
![image](https://f.cloud.github.com/assets/3534544/2346419/cd6ffae2-a541-11e3-82b7-fc81ccc0a4a1.png)


Error on invalid format:
![image](https://f.cloud.github.com/assets/3534544/2346395/8d2ef5c8-a541-11e3-90cd-f05a32db6aec.png)

Error in invalid pin:
![image](https://f.cloud.github.com/assets/3534544/2346401/9f23759c-a541-11e3-978c-6fbd7db24e17.png)

Error on invalid sip format:

![image](https://f.cloud.github.com/assets/3534544/2346409/b2d24988-a541-11e3-970c-e52af288b006.png)