[SIPForum-discussion] Polycom on TCP

[Naresh Ramaswamy]

It is an observation over Polycom650 and Polycom6000 soundstation SIP IP
phones:
Phones are configured to use TCP Only, while I make the call the INVITE is
on TCP and followed with my server responding (as configured to use) on
TCP, following to which the Polycom phone sends ACK and corresponding other
requests (such as in-dialog re-INVITE or BYE) sent over UDP.
    Strange to have this observation!
    Is this valid or am I missing here something?
    Have anyone experienced the same?
I am trying with other TCP phones from SNOM, Linksys and few other IAD's
and not finding this observation!

Kindly suggest if there are any known issues with Polycom phones.

regards,
Naresh
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