[P2PSIP] Re: Comments to draft-marocco-p2psip-interwork-01

["Enrico Marocco" <[e-mail]>]

Willekens, Marc wrote:
> *1. General remark*
> 
> Thanks for your work already done for the P2PSIP inter-working to allow 
> the interconnection between the "classic SIP" and the "new P2PSIP" 
> networks.
> 
> Question: how are we going to differentiate all the different types of 
> "SIP networks" ;-)? Conventional SIP, canonical SIP, classic SIP, IETF 
> SIP, 3GPP SIP, IMS SIP, Enterprise SIP, private SIP, public SIP, IPv4 
> SIP, IPv6 SIP, standard SIP, extended SIP, ...

I see no problem as long as the differences concern the internal 
structure on the networks.  Seen from outside, each network should 
appear just as a "conventional SIP network" and the intention of the 
interworking draft is in that sense.

> *2. Specific remarks*
> 
> [Page 4], 1.1 Terminology, §5
> 
> P2PSIP Proxy Peer: Can we also consider this in an extended way as a 
> gateway peer? Now the proxy is defined as having a function to forward 
> SIP messages from the P2PSIP network to the conventional or canonical 
> SIP networks. Is a "gateway" reserved for inter-working from SIP (P2P or 
> conventional) to non-SIP networks (such as other P2P network, PSTN, 
> etc.)? Can such a gateway also be part of the P2PSIP overlay network and 
> then defined as a "P2PSIP Gateway peer" and registered as such in the 
> p2p network or will it be kept in the conventional SIP network? Or will 
> it be part of an additional P2P overlay network? I assume that all 
> options are still open and currently the PSTN inter-working is kept in 
> the conventional SIP network.

In my very personal opinion, a gateway to non-SIP networks is a service 
which should be registered in the overlay, just as a proxy peer or a 
stun server.

> [Page 6], 2 Overview
> 
> If an addressed SIP UA does not belong to the own P2P overlay domain and 
> when the originating SIP UA is only part of the local P2P network, then 
> the request is forwarded to a P2PSIP Proxy which then belongs also to 
> one or more conventional SIP networks, one or more P2PSIP networks, or 
> one inter-domain connection network based on classic SIP or P2PSIP?

A proxy peer is registered in one P2PSIP network, plus is referred by a 
DNS record which makes it resolvable as defined in RFC 3263.  In 
general, it doesn't belong to more than one network.

> [Page 11], 3.3.3 Impacts on the overlay
> 
> When different nodes in the p2p network can fulfill the role of a proxy 
> or a relay agent, how is the selection of a specific proxy/relay made 
> out of the possible set of proxies? What kind of hash function is 
> proposed to do this? Will there only be one key-partitioning approach? 
> What when more and more distributed functions are made available but not 
> on all nodes of the p2p network, i.e. when peers start differentiating 
> more and more instead of being "real peers"?

Good question.  I think it mainly depends on how registrations of 
well-known URLs (or services) are distributed among peers.

> [Page 13], 5 Examples
> 
> Thanks for the examples.
> 
> Don't we have to consider also a case where a p2p network is used as an 
> inter-domain connection network so that the P2PSIP proxy peer can 
> request the inter-domain overlay network for the corresponding proxy of 
> the public SIP or p2pSIP terminating network? Or is this something for 
> another draft?

It is an interesting case that surely deserves more investigation.  So 
far we have been considering a flat hierarchy right below the DNS level, 
laying aside more complex structures (e.g. overlays of overlays).

-- 
Ciao,
Enrico

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