Rport queue overflow

Hello folks!
In /var/log/messages i’ve found this strange error

kernel: mISDN_rdata: rport queue overflow 256/256 [addr:52010801 prim:120282 dinfo]

repeated for many lines (20/30) only in the space of a second…
Asterisk is 1.2.9.1 and mISDN-mqueue 0.3.1

my misdn.conf

[general]

debug = 0
method=standard
bridging=yes

[default]
context=inbound_isdn
language=it
callerid=asreceived
usecallerid=yes
far_alerting=no
hdlc=yes
hold_allowed=yes
pmp_l1_check=no
jitterbuffer=4000
jitterbuffer_upper_threshold=0

Something wrong?

does this error result in any problems?