Mine

		else if (f->frametype == AST_FRAME_DTMF_BEGIN) 
		{

		//else if ((f->frametype == AST_FRAME_DTMF) && (!res)) 
		
		
                    ASTOBJ_WRLOCK(ps);
                    ps->immediate_exit = 1;
                    ASTOBJ_UNLOCK(ps);
		
		
		
			int x;
			int tries = 3;
			int maxdigits = 255;
			int to = chan->pbx ? chan->pbx->rtimeout * 1000 : 6000;
			
			char tmp[256] = "";
			
			while(tries && !res)
			{
				for (x = 0; x < maxdigits; )
				{
					res = ast_waitfordigit(chan, to);	// returns DTMF
				
					
					if (res < 1) 				// 0 on error or no entry
					{
						tmp[x]='\0';
						break;
					}
				
				
					tmp[x++] = res;				// append it to array
						
					if (tmp[x-1] == '#') 
					{
						tmp[x-1] = '\0';		// # delimits
						break;
					}
				}

				if (res > -1) 
				{
					pbx_builtin_setvar_helper(chan, "SWIFT_DTMF", tmp);
					if (!ast_strlen_zero(tmp)) 
					{
						if (option_verbose > 2)
							ast_verbose(VERBOSE_PREFIX_3 "User entered '%s'\n", tmp);
						tries = 0;
					} 
				
					else
					{
						tries--;
						if (option_verbose > 2) 
						{
							if (tries)
								ast_verbose(VERBOSE_PREFIX_3 "User entered nothing, %d chance%s left\n", tries, (tries != 1) ? "s" : "");
							else
								ast_verbose(VERBOSE_PREFIX_3 "User entered nothing.\n");
						}
					}
					
					res = 0;
				}
				else
				{
					pbx_builtin_setvar_helper(chan, "SWIFT_DTMF", tmp);
					if (option_verbose > 2)
						ast_verbose(VERBOSE_PREFIX_3 "User disconnected\n");
				}
			}
                    ast_frfree(f);
                    
                } else { // ignore other frametypes
                    ast_frfree(f);
                }