Sending Set Asynchronous Balanced Mode Extended

any idea how solved this issues ? when happen this all call ist droped

Connected to Asterisk 1.4.22 currently running on debian (pid = 2606) Verbosity is at least 130 q921.c:782 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED Sending Set Asynchronous Balanced Mode Extended q921.c:211 q921_send_sabme: q921_state now is Q921_AWAITING_ESTABLISH -- Got UA from network peer Link up. q921.c:782 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED q921.c:733 q921_dchannel_up: q921_state now is Q921_LINK_CONNECTION_ESTABLISHED == Primary D-Channel on span 1 up q921.c:782 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED Sending Set Asynchronous Balanced Mode Extended q921.c:211 q921_send_sabme: q921_state now is Q921_AWAITING_ESTABLISH -- Got UA from network peer Link up. q921.c:782 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED q921.c:733 q921_dchannel_up: q921_state now is Q921_LINK_CONNECTION_ESTABLISHED == Primary D-Channel on span 1 up debian*CLI>

Fuond how to resolve?