SIP Trunking - ptime

[Hershel]

Just installed SIP trunking from a new carrier on a 5000 V6.1

Incoming is working perfect, outgoing works with the exception of specific numbers, where we are seeing a 488 error "Not Accepted Here" 

Seems like a carrier issues to me but they have asked us to change the ptime setting from 30 to 20

v=0
o=Mitel-5000-ICP 35394288 1459783486 IN IP4 172.22.32.50
s=SIP Call
c=IN IP4 172.22.32.50
t=0 0
m=audio 6186 RTP/AVP 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=ptime:30
a=maxptime:30
a=cdsc:1 image udptl t38

I don't have a clue how this is done or why it would make a difference. 

[acejavelin]

`ptime` in Packetization Time, this is in IP Call Configuration, I think it is called Minimum Playback Time (going from memory, could be wrong).

[Hershel]

Just an update after speaking with Mitel tech support
ptime = payload time

The ptime is set under the IP Call Configuration but it is referred to as Audio Frames/IP Packet.  Each frame is 10sec of audio so setting the Audio Frame to 2 = 20ms ptime

[acejavelin]

I was close... that counts right?