In pjsua_acc_config you have two parameters, I have not checked but I
think you can set these through pjsua otherwise just change the init of
pjsua when defining the pjsua_acc_config.
/**
* Additional parameters that will be appended in the Contact header
* for this account. This will affect the Contact header in all SIP
* messages sent on behalf of this account, including but not limited to
* REGISTER, INVITE, and SUBCRIBE requests or responses.
*
* The parameters should be preceeded by semicolon, and all strings must
* be properly escaped. Example:
* ";my-param=X;another-param=Hi%20there"
*/
pj_str_t contact_params;
/**
* Additional URI parameters that will be appended in the Contact URI
* for this account. This will affect the Contact URI in all SIP
* messages sent on behalf of this account, including but not limited to
* REGISTER, INVITE, and SUBCRIBE requests or responses.
*
* The parameters should be preceeded by semicolon, and all strings must
* be properly escaped. Example:
* ";my-param=X;another-param=Hi%20there"
*/
pj_str_t contact_uri_params;
