### Description

Calling ``KSR.dialplan.dp_translate(<id>)`` always produces ERROR in parameters since the default ones are not used in KEMI function ``ki_dp_translate_id()``

#### Log Messages

``` dialplan [dialplan.c:877]: ki_dp_translate(): invalid destination var name for input or output ```

### Possible Solutions

use default "$rU/$rU" as documented https://kamailio.org/docs/modules/5.6.x/modules/dialplan.html#dialplan.p.dp_...

### Additional Information

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

``` version: kamailio 5.6.4 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, 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_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, 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 with gcc 10.2.1

```