Re: Flexisip as push proxy - my setup

[François Grisez]

Hi Björn,

 

Thank you for this user experience feedback. Actually, we are working on the documentation of Flexisip to improve its usability, but the pages about Push Notifications and Push Gateways haven't been reworked yet. The documentation is to be ready for the next version of Flexisip, which should be released next month. Your feedback will be take into account when the related pages will be under reworking.

 

Best regards,
--

François Grisez

Software Engineer

Belledonne Communications

 

On samedi 25 avril 2020 23:56:23 CEST Björn Tackmann wrote:

> Dear flexisip devs and users,

>

> I am using flexisip as a push proxy for a VOIP provider. My (only)

> requirement was that incoming VOIP calls should have my phone ring even

> when the app is in background. Yet, as setting this up took me quite a bit

> of time, I wanted to post some learnings here.

>

> First, please find below the configuration settings I had to change with

> respect to the description on the wiki page on push gateways (i.e.

> https://wiki.linphone.org/xwiki/wiki/public/view/Flexisip/HOWTOs/Push%20Gat

> eway/). The settings described there were very helpful, but not sufficient

> for me.

>

> =======

> [global]

>

> # Allow large UDP packets. The default setting of 1460 caused failing

> connections. udp-mtu=65535

>

>

> [presence-server]

>

> # My setup runs without one.

> enabled=false

>

>

> [conference-server]

>

> # Not needed in my proxy use case.

> enabled=false

>

>

> [module::NatHelper]

>

> # This was crucial for me. The upstream server would otherwise not accept

> some messages such as BYE, because the “verified” tag was still in there. I

> fortunately don’t need the NatHelper. enabled=false

>

>

> [module::PushNotification]

>

> # I want immediate pushes.

> timeout=0

>

>

> [module::Forward]

>

> # The proxy has the sole purpose of forwarding to a VOIP provider.

> route=sip:my_voip_provider:5060

> =======

>

> For iOS push notifications, I am currently using a developer certificate.

> Somehow flexisip does not detect this correctly, so I just did the

> following change in src/pushnotification/pushnotificationservice.cc:

> -static const char *APN_PROD_ADDRESS = "gateway.push.apple.com";

> +static const char *APN_PROD_ADDRESS = "gateway.sandbox.push.apple.com";

> Oh … and note that you do need a VOIP certificate from Apple! (This is

> different from a standard push certificate!) Which of course anyway means

> you need an Apple Developer account. And you also need to compile/deploy

> the app yourself.

>

> In the iOS app, it is important (for my setup, that may depend) that I am

> enabling “Outbound proxy” in the account settings. And of course set the

> proxy field appropriately.

>

> There are also some minor tweaks. As my VOIP provider has a maximum

> expiration time of 600s, I am using a cron job with flexisip_pusher every 5

> minutes to trigger my phone to send a new REGISTER. This simple solution

> works and battery drain is lower than I expected — hardly noticeable. Also,

> I am using acme.sh for managing my TLS certificates and wrote a deploy hook

> for flexisip, happy to share if someone is interested.

>

> Setting this up was quite a bit of work. I’m not sure I would have started

> if I had known that extent from the start. But now I have a working setup

> and it seems quite reliable … so all good.

>

> Best regards,

> Björn

 

 

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