eofster/Telephone — Issue #47: Support full DTMF tone set
Author: miken32
Created: 2012-02-17 04:06:36+00:00
State: open

I have some equipment that is controlled by DTMF including A, B, C, and D.

Line 216 of Classes/ActiveCallViewController.m can be simply changed from:
```
= [NSCharacterSet characterSetWithCharactersInString:@"0123456789*#"];
```
to
```
= [NSCharacterSet characterSetWithCharactersInString:@"0123456789*#abcd"];
```

This should allow for sending of all DTMF tones. Thanks!