Hi,

On Thu, Aug 3, 2017 at 3:26 AM, Arslan Saeed arslansaeed@gmail.com wrote:

We are seeing that Kamailio's nat_helper_module function  of add_rcv_param(), inserts " (quote) mark to some of the SIP headers (as below in the contact header in sip 200 OK response)

Contact: sip:172.70.1.2:5060;bnc;received="sip:118.107.184.242:25090";expires=172

We got few SIP UAs that are complaining about the quote mark inclusion in contact header and responding back with SIP 400 bad syntax status code.

Requesting views / suggestions from community about this behavior of kamailio and any workarounds available.

Indeed the quotes are put around the received address by nathelper - and that has been the case since the initial commit. However, the same param is for example added by the path module, but without quotes.

I have created a Pull request removing those quotes. However, I did not try the change locally. Maybe you can grab the patch from here and apply it to your Kamailio: https://github.com/kamailio/kamailio/pull/1203

I've never used this function and don't know what it I could use it for. We only use the add_contact_alias() function for appending the received information. This information is later used when sending incoming calls to registered clients.

HTH Sebastian