[Asterisk-Users] Sync Source: Internally clocked

[bails]

Hi whatever I set the span line to in zaptel.conf

ie     span=1,0,0,ccs,hdb3,crc4
       span=1,1,0,ccs,hdb3,crc4
       span=1,2,0,ccs,hdb3,crc4

zttool always shows

Sync Source: Internally clocked

surely this cannot be correct.