asterisk users - Jul 2008 - Unrecognized prilocaldialplan TON modifier: 5

Hi,

 I'm having strange warning from asterisk when I try to dial GSM Gateway:

    -- Executing [1011501522xxx at sm:1] NoCDR("SIP/ibm-b2c52848",
"") in
new stack
    -- Executing [1011501522xxx at gsm:2] Dial("SIP/ibm-b2c52848", 
"Zap/R3/501522xxx") in new stack
    -- Requested transfer capability: 0x00 - SPEECH
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
[Jul 13 11:58:50] WARNING[18208]: chan_zap.c:2731 zt_call: Unrecognized 
prilocaldialplan TON modifier: 5
    -- Called R3/501522xxx
    -- SIP/sempron-0829ba70 is making progress passing it to 
SIP/kowal-b2c35fe8
    -- Zap/113-1 is proceeding passing it to SIP/ibm-b2c52848
    -- Zap/113-1 is making progress passing it to SIP/ibm-b2c52848
  == Spawn extension (na-miasto, 1010501522xxx, 5) exited non-zero on 
'SIP/kowal-b2c35fe8'
    -- Executing [h at na-miasto:1] Hangup("SIP/kowal-b2c35fe8",
"") in new
stack

I've tried to google sth about this error but I found nothing. ZAP card 
is Sangoma A104d, group 3 configured as Master, EuroISDN, hw EC on.

Marcin