http://www.cisco.com/en/US/partner/products/hw/routers/ps221/prod_configuration_guide09186a0080106d1c.html
it says regarding codec complexity:
highSpecifies two voice channels encoded in the following formats:
G.711a-law, G.711u-law, G.723 Annex A(r5.3),
G.723 Annex A(r6.3), G.723(r5.3), G.723(r6.3),
G.726(r16), G.726(r24), G.726(r32), G.728
G.729(br8), G.729(r8).
mediumSpecifies four voice channels encoded in the following formats:
G.711a-law, G.711u-law, G.726(r16),
G.726(r24), G.726(r32), G.729(br8), G.729(r8).
Configuring the codec complexity as medium, blocks the G.723(8) and G.728 voice calls on the voice-card.
So is g.711 and g.729br8 ulaw high or low? how can it be both?