### 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 ```