Re: [Linphone-developers] Using SIPAddHeader to force Auto-answer

[Matt Murphy]

I discovered that I was doing something boneheaded. I have been using PJSIP on my Asterisk server, so the SIPAddHeader() entry I made in extensions.conf wasn't valid. I attempted to use exten => n,1,Set(PJSIP_HEADER(add,Call-Info)=answer-after=0) and that did not work either. So, I decided to abandon PJSIP and go back to SIP as a test (using the aforementioned SIPAddHeader() strategy). Now, sal_call_autoanswer_asked() is aware of the auto-answer request and I can move forward.

So, as an embarrassing follow-up question: was I wasting my time attempting this with PJSIP? I had calls working fine when using PJSIP, so I guess I just assumed all was right with the universe and I could use the PJSIP_HEADER to do what I needed. Perhaps I used it wrong, or maybe there is basic support for PJSIP, but adding the header isn't supported? I'm still very new to a lot of this, so I am learning how all of these pieces fit together. Every day is a journey!

If I discover anything else, I will share.

Thanks,

--Matt

 

On Tuesday, May 12, 2015 1:59 PM, Matt Murphy <address@hidden> wrote:

Hi Guillaume,

I think I have an idea of how to do this. What you recommended makes a lot of sense. My only issue now is that linphone_call_asked_to_autoanswer() always returns 0. More specifically, sal_call_autoanswer_asked() always returns 0. I am not sure if I have the correct format of SIPAddHeader in my Asterisk extensions.conf file. I have tried:

same => n,SIPAddHeader(Call-Info: answer-after=0)

and

same => n,SIPAddHeader(Call-Info:answer-after=0)

It appears that Asterisk is happy with what I am doing because I see:

 -- Executing address@hidden:2] SIPAddHeader("PJSIP/6001-00000000", "Call-Info: answer-after=0") in new stack

But nevertheless, I still see 0 returned for linphone_call_asked_to_autoanswer()and sal_call_autoanswer_asked().

I'll keep fighting the good fight. I might just be doing something boneheaded.

Thanks for all your help. I really do appreciate it.

--Matt

 

On Monday, May 11, 2015 6:04 AM, Guillaume Bienkowski <address@hidden> wrote:

Hi Matthew,

Indeed, this function will tell you if the user asked for an auto answer, which is exactly what you put in your header.

Relevant source code is here: https://github.com/BelledonneCommunications/linphone/blob/83f4d9554514f0f2888a614436ca717ff991ecd0/coreapi/bellesip_sal/sal_op_call.c#L538

On the other hand, linphone does not answer automatically when this flag is set as of today. We could implement it with a configuration option in the linphonerc file at some point but it is not yet the case.

You could do it yourself if you use the Linphone library in your project: on the call_state_changed callback with state LinphoneCallIncomingReceived , you call this linphone_call_asked_to_autoanswer() and if it returs TRUE, you answer the call.

Guillaume Bienkowski

address@hidden

Le 7 mai 2015 à 18:16, Matt Murphy <address@hidden> a écrit :

As an addendum to my previous post, I found a function linphone_call_asked_to_autoanswer() function in coreapi/linphonecore.c. However, I cannot find any evidence that this function is ever called. I feel like this is on the correct path, but I am unsure of how (or where) to utilize it in order to enable auto-answer upon receiving an instruction in the SIP Header.

Has anyone had any experience with this?

Thanks,

--Matt

On Thursday, May 7, 2015 9:24 AM, Matt Murphy <address@hidden> wrote:

Greetings everyone,

I am attempting to page my linphone appliance (connected to an Asterisk server) by dialing a special extension. The trouble is that when I use the Asterisk Page() command, my linphone appliance rings. I would like linphone to auto-answer the page. I searched around and found some information on this from back in 2010:

[Linphone-developers] autoanswer and answer-after=0

This appears to be exactly what I am looking for - in essence, a way to inject the auto-answer behaviour into the SIP header. 

I tried adding the following to my Asterisk extensions.conf file:

exten => 333,1,Verbose(Paging)

same => n,SIPAddHeader(Call-Info: answer-after=0)

same => n,Set(PageExts=PJSIP/6003&PJSIP/6010)

same => n,Page(${PageExts},i,120)

I guess my question is two-fold:

1) Is this behaviour supported by linphone?

2) Am I correctly invoking the auto-answer by what I have above?

Thank you for all your help,

--Matt

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