[asterisk-dev] SIP Channel fails to parse refer_to_domain

Clod Patry cpatry at gmail.com
Fri Nov 29 23:12:51 CST 2013

yes, open a ticket on the bug tracker.

On Fri, Nov 29, 2013 at 6:48 AM, Jan Gaida <jan.gaida at grupoamper.com> wrote:

> Hello,
> The scenario is an attended transfer to a remote domain.
> The short description:
> When Asterisk receives a REFER message with a refer-to header that
> contains "?replaces=" query, in chan_sip's function "get_refer_info" the
> domain is extracted with the query-part. That leads to an error (no such
> host) when trying to send the INVITE to this domain.
> The solution is to remove the query part ('?') in the get_refer_info
> function (see attached diff file).
> ---
> The following is a description of the events like a SIP trace; with A
> being transferor, B transferee (Asterisk) and C the transfer-target.
> Two calls are established: call1 between B and A, and call2 between A and
> C.
> When starting the transfer, the transferor A sends a REFER to Asterisk (B):
> A -> REFER (Refer-to: <sip:C at domain?replaces=call2>) -> B
> B -> 202 Accepted -> A
> B -> Notify sipfrag 200 ok -> A
> A -> 200 ok -> B
> Now, there should be an outgoing INIVTE with Replaces header:
> B -> INVITE (Replaces: call2) > C
> But this INVITE never is send.
> In Asterisk's traces you see the following:
>   chan_sip.c: Attended transfer: Will use Replace-Call-ID : call2 (No
> check of from/to tags)
>   chan_sip.c: SIP transfer to extension C at internal by A at domain
>   chan_sip.c: This SIP transfer is to a remote SIP extension (remote
> domain domain?Replaces=call2)
> Here you can see the error ^^^^. The remote domain still contains the
> query part (?Replaces) of the uri.
> The traces then continue:
> chan_sip.c: SIP attended transfer: Still not our call - generating INVITE
> with replaces
> Then it enters the dialplan where it is redirected with a Dial command:
> logger.c:     -- Executing [s at callreferred:4] Dial("SIP/domain-09a40b60",
> "SIP/C at domain?Replaces=call2|60|") in new stack
> And finally the error:
> WARNING[32395] chan_sip.c: No such host: domain?Replaces=call2
> DEBUG[32395] chan_sip.c: Cant create SIP call - target device not
> registered
> ---
> With the attached patch, Asterisk behaves as expected.  Should I open an
> issue on the tracker?
> Regards
> Jan
> --
>     *Jan **Gaida*
> Ingeniero Desarrollo Software     C/ Marconi 3 (PTM)
> 28760 Tres Cantos
> Spain
> jan.gaida at grupoamper.com | www.grupoamper.com
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Clod Patry
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