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docs: instance ID on iOS, and which SIP server to run - #11
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- Instance-ID: why +sip.instance matters for a client that reconnects after every wake-up, why pjsua's host-name default cannot be used on iOS, what went wrong in a production client (identifierForVendor and UserDefaults before first unlock, a racing config writer, a random fallback, an SBC refusing the canonical form), and a proposed design: a Keychain-stored device ID written once, hashed per app and account. Links the upstream change, pjsip/pjproject#5313. - Own-SIP-Server: Flexisip first (built-in APNs sender, bindings keyed on the instance ID; certificate-only, no Feature-Caps, AGPL), OpenSIPS second, Kamailio and Asterisk as lab subjects. - Tech-Debt OH-11 (no instance ID of our own) and two Roadmap pointers.
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| A VoIP push in that window must still be reported to CallKit. The call can ring, but answering it | ||
| cannot register or accept the INVITE until the device has been unlocked once. The app has to fail | ||
| that answer cleanly and say why, not hang. An outgoing call does not arise there: the app cannot |
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🔍 Pre-unlock ringing needs device verification
The proposed CallKit flow assumes iOS launches the app for a VoIP push before first unlock. U4 still lists that behavior as an open device test.
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Fixed in a8ce3d9: §4 and §5.1 now say that a VoIP push launching the app before first unlock is unverified, point at U4 in Push-vs-Active-Socket, and §5.3 lists it as the first thing to verify on a device. The storage design does not depend on it: any background launch in that window has to cope with the failures in §4.
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Two new research docs and the pointers to them.
docs/Instance-ID.md—+sip.instanceon iOS. Why it matters for a client that reconnects after every wake-up (Kamailio and Flexisip key bindings on it), why pjsua's host-name default is useless on iOS (localhost), and what went wrong in a production iOS client:identifierForVendorandUserDefaultsboth unavailable before first unlock, a racing config writer, a random fallback, and an SBC that refused the canonical UUID form. Proposed design: a device ID written once to the Keychain beside the SIP secrets, hashed per app and per account for the wire (D-INST-1…4), with two decisions left open. Includes the upstream decision behind pjsua: send a configured +sip.instance without SIP outbound too pjsip/pjproject#5313 and why pjsua cannot fix its default.docs/Own-SIP-Server.md— which server to run for push and for a lab: Flexisip first (built-in APNs sender, INVITE parking, bindings keyed on the instance ID; certificate-only APNs auth, noFeature-Caps, AGPL), OpenSIPS second (complete RFC 8599 signalling, our own.p8sender), Kamailio and Asterisk as measurement subjects. How to test push without Apple.docs/Tech-Debt.md— OH-11: no instance ID of our own yet.docs/Roadmap.md— a stored instance ID before push; Flexisip first.Docs only; nothing is built yet.