PROGRESS with cause code 127 received

One issue we are seeing is when we dial 1-866-222-7056, which is a AT&T conference bridge, we hear no dialing and see in CLI the following error

– Executing [18662227056@default:1] Dial(“SIP/132-0000001e”, “DAHDI/g2/8662227056,45”) in new stack
– Requested transfer capability: 0x00 - SPEECH
– Called g2/8662227056
– DAHDI/i1/8662227056-1a is proceeding passing it to SIP/132-0000001e
– PROGRESS with cause code 127 received
– Nobody picked up in 45000 ms
– Hungup ‘DAHDI/i1/8662227056-240’
– Executing [18662227056@default:2] PlayTones(“SIP/132-00000312”, “Busy”) in new stack
– Auto fallthrough, channel ‘SIP/132-00000312’ status is ‘NOANSWER’

we are currently running asterisk 1.8.4.2
Any ideas? It was suggested to disable early media which I’m not sure how to do this.
All help is appreciated,
thanks

[quote]Cause No. 127 - Interworking, unspecified
This cause indicates that an interworking call (usually a call to 5W56 service) has ended. [/quote]

wiki.taridium.com/index.php/PRI_ … nspecified

and several other but many of them have Intel instead of Inter!