No sure it solves you case... but you can try to strip those headers:


https://freeswitch.org/confluence/display/FREESWITCH/Sofia+SIP+Stack#SofiaSIPStack-StripSIPHeaders


On 09/26/2016 04:05 AM, George Assaad wrote:
Hello,
The carrier is asking us to remove the following from the SIP invite, but we are not sure how do we generate such data to be able to remove it.
Anybody could shed some light?

X-Polycom-PBX: true.

P-Access-Network-Info: IEEE-EUI-48;eui-48-addr=E4-8A-FC-8C-AB-34.

P-Emergency-Info: IEEE-EUI-48;eui-48-addr=00-0B-99-74-AA-05.

X-accountcode: domain.

X-FS-Support: update_display,send_info.


Remote-Party-ID the value “screen=yes” to “screen=no”


Best Regards,

G



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