Installed FreePBX, applied all updates. Trunks and SIP-phones are all PJSIP.
SIP-part is fully functional.
SANGOMA A500 is installed as bri_net_ptmp to connect internal ISDN-Phones.
All defined DAHDI-extensions can be dialled (from SIP-extensions and from the outside).
When I dial from a DAHDI-extension, the dialplan only receives the CID of the calling extension but no dialled number at all.