Re: [Linphone-users] Hang up at about 30 seconds - incoming calls, with log

[Anatoli]

Hi,

Here is the original reporter of the issue at Asterisk's issue tracker. So you say you provider's Asterisk doesn't send Max-Forwards? That would be strange as it's a behavior that breaks the protocol and a lot of softphones would fail to operate with your provider, which I don't think is the case (this issue was discovered soon after Asterisk switched to PJSIP stack, so the implementation was not well tested yet). Asterisk already fixed it and for the old versions there's a configuration option (type=global).

If it's really the case (i.e. your provider is running an outdated version of Asterisk which is NOT RFC3261 compliant and they didn't apply the config work-around), then I believe your provider should take the necessary steps to solve the issue or you switch to another provider.

RFC3261 at page 35 says: "A valid SIP request formulated by a UAC MUST, at a minimum, contain the following header fields: To, From, Cseq, Call-ID, Max-Forwards, and Via; all of these header fields are mandatory in all SIP requests")

Regards,
Anatoli

From: John Statler
Sent: Wednesday, January 25, 2017 18:21
To: Linphone-users
Subject: Re: [Linphone-users] Hang up at about 30 seconds - incoming calls, with log

Sorry for the duplicate post, didn't realize Subject was wrong. Reposting just to keep some kind of sense to it all.

I found an interesting report on the Asterisk issues site (https://issues.asterisk.org/jira/browse/ASTERISK-24807) directly related to ' Missing mandatory header [Max-Forwards],'

I sent my log and the Asterisk link to my VoIP service provider in the (maybe remote) chance they will understand the fix Asterisk used.

The following, though I understand little of it, is from that Asterisk issue site.

The intent is for Max-Forwards to be added by default to outbound SIP requests. In res_pjsip/config_global.c, the Max-Forwards and User-Agent headers are configured to be added to outbound requests. Then the PJSIP module in res_pjsip/pjsip_global_headers.c is intended to send those headers out on each request.

My guess here is that this is another instance of that all-too-common config framework/sorcery mistake where the absence of a configuration section results in expected default values not being applied. As an experiment, in your pjsip.conf file, can you add the following:

[global]
type = global

Adding a global configuration section should result in the default Max-Forwards and User-agent headers being applied. If this fixes the problem, it should be easy to create a patch to fix this.

If my provider can't fix it, do you think there is any way for me to remove the requirement for that header?

Do you think the header exists on a Linphone to Linphone connection but not on the cell phone to Linphone connection?

Thanks for taking the time to review this issue.

John.

On 1/25/2017 7:51 AM, address@hidden wrote:

In this case linphone doesn't like the ack it's received.

message: 2017-01-25 04:54:33:115 channel [034002A0] [348] bytes parsed

error: 2017-01-25 04:54:33:115 Missing mandatory header [Max-Forwards] for message [ACK]

In the interest of brevity I did not include my log in this message.

--

John Statler
Computer Services Northwest
541-770-5524

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