[Sip] configuration NOTIFY in example 9.1 of outbound i-d

[jh at tutpro.com (Juha Heinanen)]

how can Bob's UA in example 9.1 of outbound i-d receive the NOTIFY
request sent by EP1 if Bob's UA is behind firewall that does not allow
EP1 to setup a new TCP connection to Bob's UA?

is it described somewhere that in this kind of situation EP1 has to
re-use the SUBSCRIBE TCP connection and that Bob's UA should not tear it
down so that it can be re-used?

-- juha
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