Try to create a simpler Goosip example

GSEMySipViewController.h

//
//  GSEMySipViewController.h
//  Gossip
//
//  Created by Jaschar domann on 13.10.14.
//
//

#import <UIKit/UIKit.h>
#import "Gossip.h"

@interface GSEMySipViewController : UIViewController

@property (nonatomic, strong) GSAccountConfiguration *accountConfig;
@property (nonatomic, strong)        GSConfiguration *configuration;
@property (nonatomic, strong)            GSUserAgent *userAgent;
@property (nonatomic, strong)              GSAccount *account;
@property (nonatomic, strong)                 GSCall *call;

@property (strong, nonatomic) IBOutlet UILabel *statusLabel;

@end

GSEMySipViewController.m

//
//  ViewController.m
//  MySIPApp
//
//  Created by Jaschar domann on 09.10.14.
//  Copyright (c) 2014 dailab. All rights reserved.
//

#import "GSEMySipViewController.h"

@interface GSEMySipViewController () <GSAccountDelegate>
{
    NSString *voipNumber;
}
@end

@implementation GSEMySipViewController

@synthesize statusLabel     = _statusLabel;
@synthesize accountConfig   = _accountConfig;
@synthesize configuration   = _configuration;
@synthesize userAgent       = _userAgent;
@synthesize account         = _account;
@synthesize call            = _call;

-(void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"view Load");
    [_statusLabel setText:@"inactive"];
    [self registerAccount];
    NSLog(@"init done...");
}

-(void)account:(GSAccount *)account didReceiveIncomingCall:(GSCall *)call
{
    [_statusLabel setText:@"Incoming call..."];
    const double delayInSeconds = 1.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    
    __block GSCall *call_ = call;
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        BOOL isBegin = [call_ begin];
        NSLog(@"isBegin: %@",isBegin ? @"YES" : @"NO");
    });
}

-(IBAction)call:(id)sender {
    [self startCall];
}

-(void)startCall
{
    voipNumber = @"chakrit@sip2sip.info";
    
    NSLog(@"Account status: %u",[_account status]);
    
    _call = [GSCall outgoingCallToUri:voipNumber fromAccount:_account];
    
    NSLog(@"call prepared...");
    
    [_call begin];
}

-(void)registerAccount
{
    // Account Configuration
    _accountConfig                 = [GSAccountConfiguration defaultConfiguration];
    _accountConfig.address         = @"223281800@sip2sip.info";
    _accountConfig.username        = @"223281800";
    _accountConfig.password        = @"iCdw5twjDsCixkVwFZJV";
    _accountConfig.domain          = @"sip2sip.info";
    _accountConfig.proxyServer     = @"sip2sip.info";
    
    NSLog(@"ringfile: %@",_accountConfig.ringbackFilename);
    
    // Configuration
    _configuration                 = [GSConfiguration defaultConfiguration];
    _configuration.account         = _accountConfig;
    _configuration.logLevel        = 5;
    _configuration.consoleLogLevel = 5;
    
    // User agent
    _userAgent                     = [GSUserAgent sharedAgent];
    [_userAgent configure:_configuration];
    [_userAgent start];
    
    NSLog(@"User agent started...");
    
    NSLog(@"Codecs:");
    NSArray *codecs = [_userAgent arrayOfAvailableCodecs];
    for (GSCodecInfo *codec in codecs) {
        NSLog(@"codecid: %@, priority: %i",codec.codecId,codec.priority);
    }
    
    // Account
    _account                       = _userAgent.account;
    _account.delegate              = self;
    [_account connect];
    
    NSLog(@"Account connected...");
    NSLog(@"Account Status: %u",[_account status]);
}

-(void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

GSEMySipViewController.xib

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
    <dependencies>
        <deployment defaultVersion="1552" identifier="iOS"/>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
    </dependencies>
    <objects>
        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="GSEMySipViewController">
            <connections>
                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
            </connections>
        </placeholder>
        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
            <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
            <subviews>
                <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="9vW-qX-yYU">
                    <rect key="frame" x="8" y="269" width="304" height="30"/>
                    <state key="normal" title="Call">
                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                    </state>
                    <connections>
                        <action selector="call:" destination="-1" eventType="touchUpInside" id="JDA-5w-mFJ"/>
                    </connections>
                </button>
            </subviews>
            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
            <simulatedScreenMetrics key="simulatedDestinationMetrics" type="retina4"/>
        </view>
    </objects>
</document>