Hi
we are a small team of 5 : 3 php experts, 1 web designer and 1 QA tester.
You need someone that has experience, and patience, and we can help you with that.
for this task to be ready fast, we need to work close toghether. if you provide us the right details, we will finish it and test it in less than 3 days.
we've integrated similar phone api's in the past and we can provide an example
also we will provide a 6 months free bug fixing on it, if the bugs occur from our mistakes