[Users] Radius extra: integer attribute type how to

Hello, I'm trying the radius-extra feature in openser cvs snapshot. In my openser.cfg I set up the following parameter: modparam("acc", "radius_extra", "Acct-Session-Time=$avp(call_length)") modparam( "avpops", "avp_aliases", "start_timestamp=i:100") modparam( "avpops", "avp_aliases", "end_timestamp=i:101") modparam( "avpops", "avp_aliases", "call_length=i:102") (...) avp_op("$avp(end_timestamp)","sub/$avp(start_timestamp)"); avp_op("$avp(end_timestamp)/$avp(call_length)","sub/$avp(start_timestamp )"); I have experienced that when I sent an Accounting-Stop request to radius server, it received the integer value as an string and it decoded the value to the chr code of the "3" In the radius log: * Attr: 46 - Acct-Delay-Time len: 6 val: 51 In the openser.log: Nov 14 16:12:09 sip2 ./openser[727]: INFO:avpops:print_avp: p=0x40623b88, flags=0x0000 Nov 14 16:12:09 sip2 ./openser[727]: INFO: id=<102> Nov 14 16:12:09 sip2 ./openser[727]: INFO: val_int=<3> How can I set the corresponding integer attribute in the request? Thanks in advance, Antal