Goal (short description)

Setup SIP-H.323 translator and/or SIP/H.323 SBC (involved in sip to sip and h.323 to h.323 calls)

Applicability

Protocol translator and/or border gateway for SIP and H.323

Prerequisites (OS, dependencies on other software)

Appropriate Cisco router with appropriate IOS. See datasheet for router type, memory and IOS requirements.
Basic IOS configuration knowledge
Router with configured network access

Configuration (OS agnostic)

Call direction and tranlation section

voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip

Alow or ban directions you want to use.

Main protocol section

h323
call start interwork
sip

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 for particular dial peer bey means of voice-class h323 commands

Codec class

voice class codec 200
codec preference 1 g711alaw
codec preference 2 g711ulaw
codec preference 3 gsmfr
codec preference 4 g729r8

You can define sets of codecs with preferences and assign these sets to dial peers. Or you can directly assign codec in dial peer, but only one.

Dial peers

H.323 dial peer that uses RAS (configured gatekeeper).

dial-peer voice 1 voip
destination-pattern 10.........
voice-class codec 200
session target ras

SIP dial peer that uses configured sip-server.

dial-peer voice 211 voip
destination-pattern 90........
voice-class codec 200
session protocol sipv2
session target sip-server

SIP UA setting

sip-ua
nat symmetric role passive
nat symmetric check-media-src
sip-server dns:domain.dom

Here is defined sip server (used in dial peers) and various sip parameters.

OS specific help

N/A - There is only CISCO IOS

Validation, confirmation tests