[cisco-voip] as5350xm: myphone cannot use g711ulaw

[ACL]

myphone -> as5350xm -> pstn 

if i enable all codecs in myphone, "show call active voice brief" shows g729r8. outbound call is ok. 

But, if we enable only g711ulaw, call is dropped immediately (ring once or no ring happened). I do have the same problem with Asterisk if i enable only g711ulaw. 

Since it is a LAN, i want to use low complexity codec only. 

For dial-peer voip, i could specify codec preference or codec used. But for dial-peer pots, i do not know how to enable a specific codec. 

pls advise. 

**** running-config *** 
dial-peer voice 100 pots 
destination-pattern 49 
no digit-strip 
direct-inward-dial 
port 2/1:D 
forward-digits 8
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