Hello all, yes, for hardware reasons (very old Sangoma card with very old firmware) I have to use OpenZAP instead of freetTDM. So, when setting the effective_caller_id that value isn't used. See that part of my dialplan here: ---snip--- <action application="set" data="effective_caller_id_number=####"/> <action application="bridge" data="OpenZAP/3/a/${dialed_ext}"/> ---snip--- That configuration works with SIP, however. The line is capable to accept a change of callerid; that was tested with asterisk. Here is the relevant part of my openzap.conf.xml ---snip--- <span name="PRI_3"> <param name="mode" value="user"/> <param name="dialect" value="q931"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> </span> ---snip--- I am at my wits end and have no more idea what I'm doing wrong. Any idea is appreciated (but don't expect a reply or thank you before Tuesday, sorry) Marcus