[Freeswitch-users] How to send a SIP MESSAGE request to an unregistered user?

[Russell Treleaven]

Is bob registered with some other registrar?
If yes, Alice's sip client can send the message to bob's address of record(
bob at his_domain.com)
Alice's registrar does not need to be involved.


On Thu, Apr 4, 2019 at 4:21 PM David R <davidr201901 at outlook.com> wrote:

> When two users have registered themselves with FS, either user can send a
> SIP SIMPLE MESSAGE request to the other via FS.
>
> For example, Alice and Bob are both registered so Alice can send a message
> to Bob and vice versa.
>
> However, my use-case is slightly different. Only Alice is registered; Bob
> is a device at some unknown location on the internet on a NATed network
> behind a firewall/gateway.
>
> Bob is able to send a SIP MESSAGE request to Alice at Domain.com and it will
> be received by FS then forwarded to Alice.
>
> My question is how can Alice get a reply MESSAGE back to Bob when he
> hasn't registered? By default, if Alice tries to reply to Bob at Domain.com,
> FS will send back a 202/Accepted to Alice, but the message will go nowhere.
>
> Given that when Bob sends his message to Alice, the source address of his
> message will be valid for a short period (therefore the source address is
> the return address), how can I ensure that when Alice sends a reply MESSAGE
> a second or two later, it gets to Bob?
>
> My initial thought was to somehow auto-register Bob in FS using the source
> address of his message. Then Alice's reply should get there. Is this
> possible? Or should Alice's reply be sent another way? I think the reply to
> Bob must come from the same address to which he sent his message.
>
> Some additional info:
>
> Alice never initiates a conversation to Bob, but will always send one
> reply message to any message from Bob.
>
> Bob actually represents up to a few thousand devices at various locations
> on the internet. These devices may send a single unsolicited message at any
> time and expect a reply message within a few seconds.
>
> ---
>
> I also tried to do this with Kamailio, but couldn't find a way to
> auto-register Bob - or save his location in the location db - in order to
> send back a reply (and Kamailio returns a 404 to Alice rather than 202).
>
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-- 
Sincerely,

Russell Treleaven
sip:rtreleaven at sip.bunnykick.ca;transport=tcp
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