Below is the tutorial on the Audio record and post the audio file on server
Reference tutorial : Here
Below is the coding.

//

//  ViewController.m

//  RecordAudio

//

//  Created by mac on 28/02/13.

//  Copyright (c) 2013 mac. All rights reserved.

//

#import <UIKit/UIKit.h>

#import <AVFoundation/AVFoundation.h>

#import "ViewController.h"

#import "ASIFormDataRequest.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize recordButton,playButton,stopButton,progressview,uploadButton;

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    playButton.enabled = NO;

    stopButton.enabled = NO;

    

    NSArray *dirPaths;

    NSString *docsDir;

    

    dirPaths = NSSearchPathForDirectoriesInDomains(

                                                   NSDocumentDirectory, NSUserDomainMask, YES);

    docsDir = [dirPaths objectAtIndex:0];

    NSString *soundFilePath = [docsDir

                               stringByAppendingPathComponent:@"sound.caf"];

    

    NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];

    

    NSDictionary *recordSettings = [NSDictionary

                                    dictionaryWithObjectsAndKeys:

                                    [NSNumber numberWithInt:AVAudioQualityMin],

                                    AVEncoderAudioQualityKey,

                                    [NSNumber numberWithInt:16],

                                    AVEncoderBitRateKey,

                                    [NSNumber numberWithInt: 2],

                                    AVNumberOfChannelsKey,

                                    [NSNumber numberWithFloat:44100.0],

                                    AVSampleRateKey,

                                    nil];

    

    NSError *error = nil;

    

    audioRecorder = [[AVAudioRecorder alloc]

                     initWithURL:soundFileURL

                     settings:recordSettings

                     error:&error];

    

    if (error)

    {

        NSLog(@"error: %@", [error localizedDescription]);

    } else {

        [audioRecorder prepareToRecord];

    }

}

-(IBAction) recordAudio

{

    NSLog(@"record audio");

    if (!audioRecorder.recording)

    {

        playButton.enabled = NO;

        stopButton.enabled = YES;

        [audioRecorder record];

    }

}

-(IBAction) playAudio

{

    NSLog(@"audio url=%@",audioPlayer.url);

    

    NSLog(@"play audio");

    if (!audioRecorder.recording)

    {

        stopButton.enabled = YES;

        recordButton.enabled = NO;

        

        NSError *error;

        

        audioPlayer = [[AVAudioPlayer alloc]

                       initWithContentsOfURL:audioRecorder.url

                       error:&error];

        

        audioPlayer.delegate = self;

        

        if (error)

            NSLog(@"Error: %@",

                  [error localizedDescription]);

        else

            [audioPlayer play];

    }

   updateTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateCurrentTime) userInfo:audioPlayer repeats:YES];

    

    //[progressview setProgress:audioPlayer.currentTime/audioPlayer.duration animated:YES];

}

- (void)updateCurrentTime

{

    if ((int)audioPlayer.currentTime<=(int)audioPlayer.duration)

    {

      [progressview setProgress:audioPlayer.currentTime/audioPlayer.duration animated:YES];  

        

    }

    else

    {

        [updateTimer invalidate];

    }

    

     

}

-(IBAction) stop

{

    NSLog(@"stop audio");

    stopButton.enabled = NO;

    playButton.enabled = YES;

    recordButton.enabled = YES;

    

    if (audioRecorder.recording)

    {

        [audioRecorder stop];

    } else if (audioPlayer.playing) {

        [audioPlayer stop];

    }

}

-(IBAction)uploadAudio:(id)sender

{

    NSLog(@"upload the audio file to the server");

    NSURL *url = [NSURL URLWithString:@"http://192.168.0.100:8888/videoUploads/Upload.php"];

    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

    //[request setData:pVideoData forKey:@"file"];

    [request addPostValue:@"sound.caf" forKey:@"name"];

    request.numberOfTimesToRetryOnTimeout = 3;

    [request setData:[NSData dataWithContentsOfURL:audioPlayer.url] withFileName:@"sound.caf" andContentType:@"multipart/form-data" forKey:@"userfile"];

    //[request addFile:[audioPlayer.url absoluteString]forKey:@"userfile"];

    [request setDelegate:self];

    [request showAccurateProgress];

    [request setRequestMethod:@"POST"];

    //[request setShouldStreamPostDataFromDisk:YES];

    [request setDidFinishSelector:@selector(postRequestSuccess:)];

    [request setDidFailSelector:@selector(postRequestFailed:)];

    [request startAsynchronous];

    NSLog(@"responseStatusCode %i",[request responseStatusCode]);

    NSLog(@"responseString %@",[request responseString]);

}

-(void)postRequestSuccess:(ASIHTTPRequest *)request

{

    NSLog(@"vidoe uplodaded successfully");

    

    NSLog(@"response Description-->%@",[request responseString]);

}

-(void)postRequestFailed:(ASIHTTPRequest *)request

{

    NSLog(@"vidoe uplodaded failed");

    NSError *error = [request error];

    NSLog(@"Error Description-->%@",[error localizedDescription]);

    

    

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

Download the source code : Here