[asterisk-bugs] [JIRA] (ASTERISK-29165) res_pjsip: malformed header Accept-Encoding in OPTIONS response

Sun Nov 15 10:36:16 CST 2020

    [ https://issues.asterisk.org/jira/browse/ASTERISK-29165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=252771#comment-252771 ] 

Asterisk Team commented on ASTERISK-29165:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution. Please note that log messages and other files should not be sent to the Sangoma Asterisk Team unless explicitly asked for. All files should be placed on this issue in a sanitized fashion as needed.

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> res_pjsip: malformed header Accept-Encoding in OPTIONS response
> ---------------------------------------------------------------
>
>                 Key: ASTERISK-29165
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29165
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip
>    Affects Versions: 18.0.1
>            Reporter: Alexander Greiner-Baer
>            Severity: Trivial
>
> When establishing a SIP Trunk between Asterisk PJSIP and Alcatel OmniPCX,
> the Alcatel periodically logs this:
> {noformat}
> Warning alarm	[sip_acceptIncorrectHeader] Header Accept-Encoding is malformed => unknown header
> {noformat}
> Logging SIP packets in Asterisk shows, that the Accept-Encoding Header
> is set to "text/plain":
> {noformat}
> <--- Received SIP request (455 bytes) from UDP:X.X.X.X:5060 --->
> OPTIONS sip:Y.Y.Y.Y SIP/2.0
> Route: <sip:Y.Y.Y.Y;lr>
> Accept: application/sdp
> User-Agent: OmniPCX Enterprise R12.3.1 m4.501.15
> To: sip:Y.Y.Y.Y
> From: sip:X.X.X.X;tag=c8743b616cc43ff1aa259447ed513231
> Contact: <sip:alcatel;transport=UDP>
> Call-ID: d5207489e2a0e69e8a31ac261d9500f2 at X.X.X.X
> CSeq: 1384889626 OPTIONS
> Via: SIP/2.0/UDP X.X.X.X;branch=z9hG4bKb4a6eabaa38a16a64588e74aef74d88b
> Max-Forwards: 70
> Content-Length: 0
> <--- Transmitting SIP response (856 bytes) to UDP: X.X.X.X:5060 --->
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP X.X.X.X;rport=5060;received= X.X.X.X;branch=z9hG4bKb4a6eabaa38a16a64588e74aef74d88b
> Call-ID: d5207489e2a0e69e8a31ac261d9500f2@ X.X.X.X
> From: <sip: X.X.X.X >;tag=c8743b616cc43ff1aa259447ed513231
> To: <sip:Y.Y.Y.Y>;tag=z9hG4bKb4a6eabaa38a16a64588e74aef74d88b
> CSeq: 1384889626 OPTIONS
> Accept: application/dialog-info+xml, application/pidf+xml, application/xpidf+xml, application/cpim-pidf+xml, application/simple-message-summary, application/simple-message-summary, application/pidf+xml, application/dialog-info+xml, application/sdp, message/sipfrag;version=2.0
> Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, REFER, MESSAGE
> Supported: 100rel, timer, replaces, norefersub
> Accept-Encoding: text/plain
> Accept-Language: en
> Server: Asterisk
> Content-Length:  0
> {noformat}
> RFC 3261 says that Accept-Encoding SHOULD be present in an options
> response. So setting it is fine, but the value "text/plain" seems
> wrong here. Permitted values according to RFC 2616 are only compression
> algorithms like gzip or the default identity encoding.
> I have patched my installation with the following and the log messages
> on the Alcatel gone away.
> Patch (Asterisk 16.2.1, Debian 10):
> {noformat}
> -- a/res/res_pjsip_dlg_options.c
> +++ b/res/res_pjsip_dlg_options.c
> @@ -33,7 +33,7 @@
>  #include "asterisk/res_pjsip_session.h"
>  #define DEFAULT_LANGUAGE "en"
> -#define DEFAULT_ENCODING "text/plain"
> +#define DEFAULT_ENCODING "identity"
>  static int options_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
>  {
> --- a/res/res_pjsip/pjsip_options.c
> +++ b/res/res_pjsip/pjsip_options.c
> @@ -94,7 +94,7 @@
>   */
>  #define DEFAULT_LANGUAGE "en"
> -#define DEFAULT_ENCODING "text/plain"
> +#define DEFAULT_ENCODING "identity"
>  /*! \brief These are the number of buckets to store AORs in */
>  #ifdef LOW_MEMORY
> {noformat}

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