Flash transfer as rfc2833 or INFO


#1

Dear sirs,
We have a FXS voip-adapter and when we try to set option “flash transfer” to “rfc2833” or “INFO” on this adapter, the Flash button doesn’t work and we get an following error:

  1. rfc2833 -
    [Oct 19 17] WARNING[32170]: chan_sip.c:6895 sip_indicate: Don’t know how to indicate condition 9
    – SIP/GATEWAY-00005623 answered SIP/2904-00005622
    [Oct 19 17] WARNING[32170]: chan_sip.c:6895 sip_indicate: Don’t know how to indicate condition 9

  2. INFO
    [Oct 19 18:28:37] WARNING[16702]: chan_sip.c:17456 handle_request_info: Unable to parse INFO message from 4908f7a420c451a15f7cc3415e02da1c@192.168.1.7. Content ▒▒

The “Flash transfer” option on voip-adapter can be set to “Attended Calltransfer” , but if the call transfering outside this voip-adapter, then asterisk don’t know about the call transfer and callback doesn’t work

Asterisk 1.6.2.20 CentOS 5.5 x86_64


#2

Flash is not a normal way of doing transfers with SIP. Some parts of Asterisk do provide some handling for flash, but I think that is more or less just to pass them through.

Transfers should eitehr be done using codes defined in features.conf, or by proper SIP REFER[/replaces] operations. Normal SIP phones are quite happy with the latter.