-- Starting simple switch on 'DAHDI/11-1'
    -- Executing [071914032@faxes:1] Set("DAHDI/11-1", "FAXOPT(gateway)=yes") in new stack
    -- Executing [071914032@faxes:2] Dial("DAHDI/11-1", "SIP/eutelia/071914032,60") in new stack
  == Using SIP RTP CoS mark 5
    -- Called SIP/eutelia/071914032
    -- Span 2: Extension 71914032@from-isdn-2 does not exist.  Rejecting call from ''.
    -- SIP/eutelia-00000005 is making progress passing it to DAHDI/11-1
    -- SIP/eutelia-00000005 answered DAHDI/11-1
    -- Channel 11 echo canceler disabled its NLP.
    -- Channel 11 detected a CED tone towards the network.
[Apr  9 21:25:36] NOTICE[1677]: channel.c:4152 __ast_read: Dropping incompatible voice frame on SIP/eutelia-00000005 of format slin since our native format has changed to 0x8 (alaw)
  == Using UDPTL CoS mark 5
[Apr  9 21:25:37] ERROR[1677]: astobj2.c:110 INTERNAL_OBJ: user_data is NULL
[Apr  9 21:25:37] WARNING[1677]: channel.c:4913 ast_write: Codec mismatch on channel DAHDI/11-1 setting write format to slin from alaw native formats 0x8 (alaw)
  == Spawn extension (faxes, 071914032, 2) exited non-zero on 'DAHDI/11-1'
    -- Hanging up on 'DAHDI/11-1'
    -- Hungup 'DAHDI/11-1'