A-law, and Mu-law are not codecs.
In element manager under your node configuration, you define which codecs you want to use, along with any configurable options.
If you track an active IP call, then the codec info is displayed in the returned data:
trac 104 1 2 0
ACTIVE VTN 104 1 02 00
ORIG VTN 104 1 02 00 VTRK IPTI RMBR 50 1 INCOMING VOIP GW CALL
FAR-END H.323 SIGNALLING IP: 172.20.112.253
FAR-END MEDIA ENDPOINT IP: 172.20.112.6 PORT: 5200
FAR-END VendorID: Nortel_CSE_1000;1.0.x
TERM VTN 096 0 04 27 KEY 0 SCR MARP CUST 0 DN 6776 TYPE 2004P2
MEDIA ENDPOINT IP: 172.20.102.182 PORT: 5200
MEDIA PROFILE: CODEC G.711 MU-LAW PAYLOAD 20 ms VAD OFF <---------- Here is the codec for this call. G.711 Mu-Law, 20 ms payload
DIAL DN 6776
MAIN_PM ESTD
TALKSLOT ORIG 78 TERM 44
EES_DATA:
NONE
QUEU NONE
CALL ID 01 4899
NETWORK CALL ID 01 1105
Just remember that on an option 11 the commmand in LD 80 to trace a TN is trak <tn>.