Trunk does not update 'host' setting after changing

My colleague has created a trunk, but being inexperienced he did not remove the *** from default settings, so the SIP trunk host setting ended up like '**sip.server.com**'
Later I've updated the settings and changed them to correct string, but still could not get it to work (the 'sip show peers' output just showed that host not specified)

So I went to the CLI and looked at 'sip show peer' output, and saw that the host that Asterisk is trying to reach is still '**sip.server.com**', despite the fact that I have changed it.
I had to remove the trunk and create it from scratch, and it worked fine.