Dial Peer Config Philosophy

[eehinesee]

Dial peers are hop-to-hop configs, and so they must be configured on each hop between the end devices. This is fine if we're connecting disparate small offices to each other via the PSTN. But if we're connecting large offices/campuses, the networks internal to the office/campus can have more than a few intervening routers. As VoIP gains widespread use on the Internet, the intervening routers can become significant in number.

Is there any work being done to create these dial peers as telephony-routing protocols with advertisements of connectivity, roughly analogous to an EIGRP or an OSPF? This would simplify telephony configs (while gaining the complexities of the routing protocols...).


Eric Hines

[Conwyn]

Hi Eric

SIP is similar to email. You have a local SIP server which uses dns to determine the ip of the other end server and then the ip of the user.

It is more complex than that but think of conwyn@cisco.com telephones eric@cln.com. How you know my domain name I do not know so it is similar to email. But equally how do you know my town with the existing telephone system.


Regards Conwyn

[Scott Morris]

heheheh.... Ah yes, to only go back and redesign how Bell Labs (AT&T) wanted the world to be!

Telephony had ALWAYS been a myriad of static routes. BUT, the big thing to realize is that they were also the deities of summarization! Only recently (the wonderful world of number portability, which I absolutely love!) has everything gone to you know where in a handbasket.

But when we create our telephony dial plans, the nice part is that we don't need to model our enterprises after real life... We have the ability to design our summarization of dial patterns, and route accordingly. It's all about efficient call legs! That's the challenge.

SIP, while different in the approach, can have the same complexity, it is merely a shift in the placement of such difficulty! But all in good fun!


Scott

[eehinesee]

Only recently (the wonderful world of number portability, which I absolutely love!) has everything gone to you know where in a handbasket.

What do you me-e-an I can't take my IP address with me when I travel across the country!?


Eric Hines

[Scott Morris]

Well... You "can". It's called Mobile IP. But nobody really implements it.
Just VPN back home, and you'll "feel" like you're taking your IP with you! (very useful if you want to grab iTunes when travelling internationally!)


Scott