UC500.com

I had setup UC520 with both FXO and SIP trunks
But I had disconnection problem with imcomming call from SIP trunk when it connect to CUE (autoattendant)when remove call use codec G729 (Because autoattendant use codec G711u)

So there are should be solution to transcode, call routing so imcomming call from G729 to converter G711 when connect to CUE

Searching from Internet I see bellow transcode command :

CME Config----------
sccp local GigabitEthernet0/0.200
sccp ccm 10.200.1.253 identifier 1
sccp
!
sccp ccm group 1
associate ccm 1 priority 1
associate profile 10 register mtp0015fad84570
!
dspfarm profile 10 transcode
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729r8
codec g729abr8
codec g729br8
maximum sessions 18
associate application SCCP
!
telephony-service
ip source-address 10.200.1.253 port 2000
sdspfarm units 1
sdspfarm transcode sessions 48
sdspfarm tag 1 mtp0015fad84570

dial-peer voice 3 voip
incoming called-number .
codec g729r8
!
dial-peer voice 4 voip
destination-pattern ^20..$
session target ras
codec g711ulaw
!
dial-peer voice 8100 voip
destination-pattern ^8100$
session protocol sipv2
session target ipv4:10.30.1.252
dtmf-relay sip-notify
codec g711ulaw
no vad

Show dspfarm all------------------------------------
Dspfarm Profile Configuration

Profile ID = 10, Service = TRANSCODING, Resource ID = 1
Profile Description :
Profile Admin State : UP
Profile Operation State : ACTIVE
Application : SCCP Status : ASSOCIATED
Resource Provider : FLEX_DSPRM Status : UP
Number of Resource Configured : 18
Number of Resource Available : 18
Codec Configuration
Codec : g711ulaw, Maximum Packetization Period : 30
Codec : g711alaw, Maximum Packetization Period : 30
Codec : g729ar8, Maximum Packetization Period : 60
Codec : g729r8, Maximum Packetization Period : 60
Codec : g729abr8, Maximum Packetization Period : 60
Codec : g729br8, Maximum Packetization Period : 60

SLOT DSP VERSION STATUS CHNL USE TYPE RSC_ID BRIDGE_ID PKTS_TXED
PKTS_RXED

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 1 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 2 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

0 3 4.4.19 UP N/A FREE xcode 1 - - -

Total number of DSPFARM DSP channel(s) 18

It seem that we have to detect MAC address of interface in command "sccp local ..." to add it in command "sdspfarm tag 1 mtp..."
I still not understand about interface of command "sccp local ,,,", and with UC520 I see the sccp local is point to "lookback0"

Please advise about this local interface- what is it, and why with UC520 this local interface is "lookback0"

and how to revised this transcode so it work with UC520