[asterisk-ss7] Complete lost of audio and ringback tone

[Goke Aruna]

\I have asterisk 1.2.12.1 installation with chan_ss7-0.9 with the patch
to support 256 channels and all seems well at 4 E1 but when i increased 
4E1 to to 6E1 then there is complete loss of audio, no ringback tone.
The errot i got from the asterisk console is as below.

Jan 24 12:41:04 WARNING[16524]: l4isup.c:1885 adjust_buffers: Limit
exceeded when trying to adjust numbufs to 8, for circuit 190.
Jan 24 12:41:04 NOTICE[16524]: l4isup.c:2007 ss7_write: Write buffer
full on CIC=190 (wrote only 0 of 160), audio lost.
Jan 24 12:41:05 WARNING[16524]: l4isup.c:1885 adjust_buffers: Limit
exceeded when trying to adjust numbufs to 8, for circuit 190.
Jan 24 12:41:05 NOTICE[16524]: l4isup.c:2007 ss7_write: Write buffer
full on CIC=190 (wrote only 0 of 160), audio lost.

I will be glad, if someone can help.

Goksie