[Serusers] "Can't connect to RTP proxy"

Hi all, I have 0.9.0 running with customized version of ser.cfg posted by Paul, I think. It works to the extent that the .cfg has so far been developed. However on “serctl start” and with traffic I get multiple logs which all seem to stem from: “send_rtpp_command: can’t connect to RTP proxy”. Can any one point me in the right direction to “resolve” this? On a connected note (I think), The cfg file is based, it seems, on nat-helper operation. I understand that nat-helper and media-proxy are mutually exclusive. but that media-proxy seems to be more powerful and well suitable for smaller systems that do not need to scale greatly. Is there any document which explains what are the fundamental differences in capabilities between the two, and ser.cfg deltas required to go from nat-helper-->media-proxy. I have found text which references one or the other but not in a comparative sense. thanks Chris --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.809 / Virus Database: 551 - Release Date: 09/12/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.809 / Virus Database: 551 - Release Date: 09/12/2004