[asterisk-bugs] [JIRA] (ASTERISK-26256) [patch] SIP/SDP origin (o=) contains brackets with IP6

[George Joseph (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-26256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

George Joseph updated ASTERISK-26256:
-------------------------------------

    Target Release Version/s: 15.0.0

> [patch] SIP/SDP origin (o=) contains brackets with IP6
> ------------------------------------------------------
>
>                 Key: ASTERISK-26256
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26256
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip
>    Affects Versions: 13.10.0
>            Reporter: Alexander Traud
>            Assignee: Alexander Traud
>            Severity: Minor
>      Target Release: 13.12.0, 14.1.0, 15.0.0
>
>         Attachments: IP6_origin_without_brackets.patch
>
>
> With the SIP channel driver _chan_pjsip_, an SDP message contains brackets when IPv6 is used as transport. This is rejected by several VoIP clients and no call can be established. The SIP channel driver _chan_sip_ does not face this issue.
> *Steps to reproduce*
> # Asterisk chan_pjsip enabled for IPv6 (compiled, configured)
> # Asterisk pjsip.conf: Endpoint’s media_address is empty (default)
> # Linphone iOS » Options » Settings » Network » Allow IPv6
> # Linphone iOS calls an internal extension, for example the Echo Test
> *Expected results*
> In SDP origin (o=), Asterisk answers the SIP-INVITE with an IP6 address without brackets, because of [RFC 2327|https://tools.ietf.org/html/rfc3266#section-4]. That is the same behavior as _chan_sip_. The original PJSIP does not send brackets natively either: [IPv6 Address Representation in PJSIP…|https://trac.pjsip.org/repos/wiki/IPv6]
> *Actual results*
> In SDP origin (o=), Asterisk answers the SIP-INVITE with an IP6 address with square brackets.
> *Notes*
> Although RFC 3266 is obsolete, I have one SIP/SDP/IP6 implementation which conforms to that because it was released before [RFC 4566|https://tools.ietf.org/html/rfc4566#section-5.2] (June 2006). Go figure! Even in in RFC 4566, I am not aware of a statement which allows brackets in unicast-addresses. Although VoIP/SIP clients should accept brackets in the o= and c= lines anyway, Linphone (tested: 3.13.9 for Apple iOS) and Nokia Mobile Phones with Symbian (tested: [Nokia S60 3rd Edition|http://www.gsmarena.com/nokia_e61-1322.php] from 2006 and [Nokia Belle Feature Pack 2|http://www.gsmarena.com/nokia_700-4021.php] from 2012) do not. Those clients are not able to establish a call because of brackets in the o= line.
> This issue was present since the introduction of chan_pjsip. One workaround is to specify ‘media_address’ with the [FQDN|https://en.wikipedia.org/wiki/Fully_qualified_domain_name] for each endpoint in _pjsip.conf_.



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