[asterisk-users] Two B-Channel Transfer (2BCT/TBCT) Trobule on DMS100 PRI

Matthew Fredrickson creslin at digium.com
Sat Nov 17 12:22:13 CST 2007

Jacob Lefkowitz wrote:
> I have not been able to get two B-channel transfer to work on DMS100 PRI.  I
> consistently get the following errors:
> [Nov  6 11:12:49] ERROR[2774]: chan_zap.c:8178 zt_pri_error: ROSE RETURN
> [Nov  6 11:12:49] ERROR[2774]: chan_zap.c:8178 zt_pri_error:    OPERATION:
> [Nov  6 11:12:49] ERROR[2774]: chan_zap.c:8178 zt_pri_error:    ERROR: RLT
> Not Allowed
> I have tried on two different DMS500 switches with two different phone
> companies.  The phone companies swear it is enabled on their end, and they
> are billing accordingly :).  This is using Asterisk 1.4.13/Zaptel
> (although it also did the same on earlier 1.4 versions).  Has anyone been
> successful with this?

Yes, I personally saw it work successfully (I wrote the code), and know 
it has been deployed on many systems.  Maybe you should ask the other 
end why the other end is saying RLT not allowed?

Also, you have to make sure that it is between an inbound call (to 
Asterisk, from DMS) and an outbound call (from Asterisk to DMS).  It 
should already check for this in libpri, but I figured I'd mention it 
just to be sure.

Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.

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