Sep 22 09:49:53 siptest /usr/sbin/kamailio[3160]: ERROR: registrar [common.c:75]: failed to parse Address of Record

Sep 22 09:49:53 siptest /usr/sbin/kamailio[3160]: ERROR: registrar [save.c:822]: failed to extract Address Of Record

Is there a problem when AoR contains "_"

for example is AoR krish_kura@sip.org is not allowed?

Thanks

Krish Kura