hi ,

Thanks Hennig,

I added the counts to check and i'll retest with the ms_+appl_changes() too.

The real problem is that the Via is getting into the relayed INVITE. I had assumed that it would not get relayed if it were removed.

Regards,

Richard

On 07/09/2021 14:05, Henning Westerholt wrote:

Hello,

please have a look here http://www.kamailio.org/wiki/tutorials/faq/main#why_changes_made_to_headers_... http://www.kamailio.org/wiki/tutorials/faq/main#why_changes_made_to_headers_or

Cheers,

Henning

--

Henning Westerholt – https://skalatan.de/blog/ https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

*From:*sr-users sr-users-bounces@lists.kamailio.org *On Behalf Of *Richard Robson *Sent:* Tuesday, September 7, 2021 2:10 PM *To:* Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org *Subject:* [SR-Users] via header not removed wit hremove_hf()

during testing I need to remove a Via header

This is the code snippet

route[REPLACE_VIA] {

xlog ("L_INFO", "[REPLACE_VIA] Start of block\n");

xlog ("L_INFO", "[REPLACE_VIA] $hdrc(Via) Via headers\n");

if(remove_hf("Via")) {

xlog ("L_INFO", "[REPLACE_VIA] removed Via\n");

}

else {

xlog ("L_INFO", "[REPLACE_VIA] did not remove Via\n");

}

xlog ("L_INFO", "[REPLACE_VIA] $hdrc(Via) Via headers\n");

and this is the logs output

Sep  7 08:00:00 INFO: _LOG: 3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_RURI] Start of block

Sep  7 08:00:00 INFO: _LOG: 3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] Start of block

Sep  7 08:00:00 INFO: _LOG: 3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] 1 Via headers

Sep  7 08:00:00 INFO: _LOG: 3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] removed Via

Sep  7 08:00:00 INFO: _LOG: 3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] 1 Via headers

From the logs it looks like the remove_hf returns true and we have the header removed, but its still counting the Via header and the Via Header is still present when the INVIE is releyed on

Regards,

Richard

its a bit of a hack, but the bottom line is the Via has a private IP address in it which the carrier we are using  does not like and is rejection the call. so i want to remove it to prove a point.

its getting relayed from a kamailio that has topology hiding  to a carrier by this intermediate box and this intermediate bos has some manual TH. Its not my design and i'm just trying to fix it.

R

On 07/09/2021 14:25, Henning Westerholt wrote:

Hello,

Just a note - maybe you are having some special requirements, but usually you do not need to manipulate the Via header in Kamailio.

If you are relaying the request, why do you do not want to have a Via added to the message? It’s a requirement by RFC 3261 for a stateful proxy.

Cheers,

Henning

--

Henning Westerholt – https://skalatan.de/blog/ https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

*From:* Richard Robson richard@rikrobson.co.uk *Sent:* Tuesday, September 7, 2021 3:13 PM *To:* Henning Westerholt hw@skalatan.de; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org *Subject:* Re: [SR-Users] via header not removed wit hremove_hf()

hi ,

Thanks Hennig,

I added the counts to check and i'll retest with the ms_+appl_changes() too.

The real problem is that the Via is getting into the relayed INVITE. I had assumed that it would not get relayed if it were removed.

Regards,

Richard

On 07/09/2021 14:05, Henning Westerholt wrote:

Hello,

please have a look here
http://www.kamailio.org/wiki/tutorials/faq/main#why_changes_made_to_headers_or
<http://www.kamailio.org/wiki/tutorials/faq/main#why_changes_made_to_headers_or>

Cheers,

Henning

-- 

Henning Westerholt – https://skalatan.de/blog/
<https://skalatan.de/blog/>

Kamailio services – https://gilawa.com <https://gilawa.com/>

*From:*sr-users <sr-users-bounces@lists.kamailio.org>
<mailto:sr-users-bounces@lists.kamailio.org> *On Behalf Of
*Richard Robson
*Sent:* Tuesday, September 7, 2021 2:10 PM
*To:* Kamailio (SER) - Users Mailing List
<sr-users@lists.kamailio.org> <mailto:sr-users@lists.kamailio.org>
*Subject:* [SR-Users] via header not removed wit hremove_hf()

during testing I need to remove a Via header

This is the code snippet

route[REPLACE_VIA] {

    xlog ("L_INFO", "[REPLACE_VIA] Start of block\n");

    xlog ("L_INFO", "[REPLACE_VIA] $hdrc(Via) Via headers\n");

if(remove_hf("Via")) {

xlog ("L_INFO", "[REPLACE_VIA] removed Via\n");

}

else {

xlog ("L_INFO", "[REPLACE_VIA] did not remove Via\n");

}

    xlog ("L_INFO", "[REPLACE_VIA] $hdrc(Via) Via headers\n");

and this is the logs output

Sep  7 08:00:00 INFO: _LOG:
3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_RURI] Start of
block

Sep  7 08:00:00 INFO: _LOG:
3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] Start of block

Sep  7 08:00:00 INFO: _LOG:
3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] 1 Via headers

Sep  7 08:00:00 INFO: _LOG:
3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] removed Via

Sep  7 08:00:00 INFO: _LOG:
3a547f956d65fe985ba189916047fc320ae150ad: [REPLACE_VIA] 1 Via headers

From the logs it looks like the remove_hf returns true and we have
the header removed, but its still counting the Via header and the
Via Header is still present when the INVIE is releyed on

 Regards,

Richard