### Description

Incoming Invite triggers CCR toward OCS.
In CCA with Result-Code DIAMETER_SUCCESS (2001) missing Result-Code in 
Multiple-Services-Credit-Control AVP.
Kamailio handles this successful charging transaction as a failure in the 
following lines:
        if (ro_cca_data->mscc->resultcode != 2001) {
                LM_DBG("CCA failure at MSCC level with resultcode [%d]\n", 
ro_cca_data->mscc->resultcode);
                error_code = RO_RETURN_FALSE;
        goto error1;
        }

The resultcode is mandatory in this statement, so if 
Multiple-Services-Credit-Control AVP does not contain Result-Code which is 
optional according to RFC 4006 the charging transaction is considered as failed.

#### Reproduction

To reproduce the issue the diameter CCA should look as following:

Diameter Protocol
    Version: 0x01
    Length: 392
    Flags: 0x40, Proxyable
    Command Code: 272 Credit-Control
    ApplicationId: Diameter Credit Control Application (4)
    Hop-by-Hop Identifier: 0x66ea324d
    End-to-End Identifier: 0x8777d597
    [Request In: 2623]
    [Response Time: 0.457246000 seconds]
    AVP: Session-Id(263) l=52 f=-M- val=ar.voice-pre-5.domain.int;843835511;1
    **AVP: Result-Code(268) l=12 f=-M- val=DIAMETER_SUCCESS (2001)**
    AVP: Auth-Application-Id(258) l=12 f=-M- val=Diameter Credit Control 
Application (4)
    AVP: CC-Request-Type(416) l=12 f=-M- val=INITIAL_REQUEST (1)
    AVP: CC-Request-Number(415) l=12 f=-M- val=0
    AVP: CC-Session-Failover(418) l=12 f=-M- val=FAILOVER_NOT_SUPPORTED (0)
    AVP: Unknown(12018) l=45 f=VM- vnd=12239 
val=31363239386664653539382d303030303465363864343333...
    AVP: Unknown(12019) l=76 f=VM- vnd=12239 
val=00002ef4c000001800002fcf532e5441522e30302e303030...
    AVP: Unknown(12011) l=16 f=VM- vnd=12239 val=00000000
    **AVP: Multiple-Services-Credit-Control(456) l=56 f=-M-
        AVP Code: 456 Multiple-Services-Credit-Control
        AVP Flags: 0x40
        AVP Length: 56
        Multiple-Services-Credit-Control: 
000001af40000014000001a44000000c0000005a00000364...
            AVP: Granted-Service-Unit(431) l=20 f=-M-
            AVP: Time-Quota-Threshold(868) l=16 f=V-- vnd=TGPP val=127.0.0.1**
    AVP: Origin-Host(264) l=15 f=-M- val=sim-dra
    AVP: Origin-Realm(296) l=29 f=-M- val=tlf-ar.ocs.com


### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.1.2 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, 
USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, 
TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, 
USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 
MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown 
compiled on 13:24:45 Apr  7 2018 with gcc 4.9.2
```

* **Operating System**:
```
Linux voice-pre-5 4.9.0-0.bpo.2-amd64 #1 SMP Debian 4.9.18-1~bpo8+1 
(2017-04-10) x86_64 GNU/Linux
```


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