I'm configuring several routers for VOIP. The Central one(1) is a 3640 with an E1 NM-HDV, using ISDN PRI. The routers on the edge are 1750 and 1751 with 2 or 4 ports E&M. In one site with 1751(2) (IOS 12.2(8)T) it's possible to call the central site(1) (Delay ~105 ms), but from this site to another site (1750)(3) the call get droped (the other side still listen the audio) after a random time (1 to 20 secs). The delay from one site to another is higher (~ 160 ms).
I'm using RTP priority, Multilink PPP, and Compressed RTP.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.