VoIP

// Register VoIP Push with Apple
- (void)registerForVOIPPush
{
    _voipRegistry = [[PKPushRegistry alloc] initWithQueue:nil];
    _voipRegistry.delegate = self;
    _voipRegistry.desiredPushTypes = [NSSet setWithObject:PKPushTypeVoIP];
}

// The VoIP token will be returned to you in the delegate method and needs to be reported to the Tencent Cloud backend.
- (void)pushRegistry:(PKPushRegistry *)registry didUpdatePushCredentials:(PKPushCredentials *)pushCredentials forType:(PKPushType)type
{
    NSData *token = pushCredentials.token;
    [self reportVOIPToken:token];
}

- (void)reportVOIPToken:(NSData *)token
{
    // Note: `config.certificateID` is the certificate ID generated after the certificate is uploaded to the IM console, and it is different for the development environment and for the production environment.
    NSLog(@"[TUIOfflinePushManager] %s", __func__);
    if (token) {
        V2TIMVOIPConfig *config = [[V2TIMVOIPConfig alloc] init];
        config.token = token;
        config.certificateID = self.voipCertificateID;
        [[V2TIMManager sharedInstance] setVOIP:config succ:^{
            NSLog(@"%s, succ, id:%zd", __func__, config.certificateID);
        } fail:^(int code, NSString *desc) {
            NSLog(@"%s, fail, %d, %@", __func__, code, desc);
        }];
    }
}

NSDictionary *ext = @{
            @"entity": @{
                    @"action": @1,
                    @"content": @"this is voip push",
                    @"sender": @"senderid",
                    @"nickname": @"nickName",
                    @"faceUrl": @"",
                    @"chatType": @(V2TIM_C2C)
            }
        };
NSData *data = [NSJSONSerialization dataWithJSONObject:ext options:NSJSONWritingPrettyPrinted error:nil];

V2TIMOfflinePushInfo *pushInfo = [[V2TIMOfflinePushInfo alloc] init];
pushInfo.ext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
pushInfo.iOSPushType = V2TIM_IOS_OFFLINE_PUSH_TYPE_VOIP;// Marked as VoIP Push

[V2TIMManager.sharedInstance sendMessage:message
                                receiver:# your userID #
                                 groupID:# your groupID #
                                priority:V2TIM_PRIORITY_DEFAULT
                          onlineUserOnly:NO
                         offlinePushInfo:pushInfo
                                progress:nil
                                    succ:nil
                                    fail:nil
}];