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Here can be set protocol parameters like slow start and fast start for H.323. Call start interwork allows translation between these modes. Protocol setting can changes be changed for particular dial peer bey i.e. by means of voice-class h323 commands or by appropriate commands directly in dial peers

No Format
voice class h323 500
  call start fast

...

No Format
dial-peer voice 211 voip
destination-pattern 91........
voice-class codec 200
session protocol sipv2
session target ipv4:5.6.7.8

H.323

...

dial

...

peer

...

that

...

uses

...

RAS

...

(configured

...

gatekeeper).

No Format
dial-peer voice 1 voip

...


destination-pattern 10.........

...


voice-class codec 200

...


session target ras

...

noformat


H.323

...

dial

...

peer

...

that

...

routes

...

to

...

another

...

gw

...

or

...

endpoint

No Format
dial-peer voice 1 voip

...


destination-pattern 11.........

...


voice-class codec 200

...


voice-class h323 500

...


session target ipv4:9.8.7.6

...

noformat


Specific

...

h323

...

class

...

is

...

configured

...

to

...

change

...

some

...

parameters.

...

SIP

...

UA

...

settings

No Format
*
sip-ua

...


nat symmetric role passive

...


nat symmetric check-media-src

...


sip-server dns:domain.dom

...

noformat


Here

...

is

...

defined

...

sip

...

server

...

(used

...

in

...

dial

...

peers)

...

and

...

various

...

sip

...

parameters.

...

Gatekeeper settings

No Format

interterface Loopback0

...


description MGMT Loopback

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ip address 1.2.3.4 255.255.255.255

...


h323-gateway voip interface

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h323-gateway voip id GK1 ipaddr 1.1.1.1 1718 priority 100

...


h323-gateway voip id GK2 ipaddr 1.1.1.2 1718

...


h323-gateway voip h323-id IP2IPGW

...


h323-gateway voip tech-prefix 1#

...


h323-gateway voip bind srcaddr 1.2.3.4

...

noformat

Gatekeeper settings for ras session target in dial peers with primary and secondary gatekeeper. It is not necessary to configure it on Loopback interface.


There seems to be a BUG that affects H.323 slowstart to SIP calls if sip server is not set by ipv4:1.2.3.4.

OS specific help

N/A - There is only CISCO IOS

Validation, confirmation tests

Route call through IP2IP gw.
If you don't use sip server and gatekeeper, set dial peer destinations (session-target) directly to endpoints and call each other ( i.e. sip:numberofh323endpoint@ipofip2ip)