asterisk users - Jul 2012 - just did sched_add waitid Warnings 1.8.14.1

I'm getting the following warning with SOME calls on 1.8.14.1  Is it a cause
for concern?   Is there a way to fix it?   I can't tell for sure if it is
impacting calls or not.

WARNING[27796]: chan_sip.c:20497 handle_response_invite: just did sched_add
waitid(4077) for sip_reinvite_retry for dialog
358b7af85cf24cf0609cb0195b273935@[ip removed] in handle_response_invite