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New Member

SIP Trunk to 2811


We have Cisco 2811 with CCME and also act as H.323 gateway for branch VOIP traffic. Cisco IP phones are registered in the router and there's a PRI E1 connection to PSTN cloud from the router. One Service provider offers SIP trunk.

Q1. Is it possible to configure SIP trunk in 2811 and enable calls between H.323, SIP & PSTN?

Q2. If possible, what are the pre-requisities ?

          * IOS

          * Additional Resources

Q3. Highly appriciate if someone can provide  sample configuration with simple dial peers to enable voice routing between SIP, H.323 & PSTN cloud?

Thank you


Everyone's tags (3)
Cisco Employee

Re: SIP Trunk to 2811

The short answer is, yes.  It is possible. Without knowing the details of your call flow, I can't really provide specific config guidance.  In order to enable CUBE functionality (IPIPGW), you will need to add the following:

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

For more details, please see the CUBE configuration guide:

If you have specific config questions, please post details about your exact call flow.

New Member

Re: SIP Trunk to 2811

Thanks for the prompt support.

Existing setup: refer attached diagram & router configs

As explained earlier Location-1 is connected with PSTN PRI e1 and 2 mbps data link.

Call flow:

Location 01:

E1 Number series: 038-42911XX

Local Extensions: 33XX

PSTN Access Code: 9 followed by 7 digits for local and 10 digits for national calls

Location 01 can directly dial location02 by using 4-digit extension (62[345]x)

Location 02:

Local Extensions: 62[345]X

PSTN Access C ode: 9 followed by 7 digits for local and 10 digits for national calls. These calls will connect to PSTN cloud through Location 01.

Location 02 can directly dial location-1 by using 4-digit extension (33xx)

In the proposed setup, the SIP trunk colored in red is introduced.  Could you please help me to configure the SIP trunk in the 2811 router and route calls through it? For example assume we need to route PSTN calls through SIP trunk using access code 8 which is currently doing by access code 9. Also need to terminate incoming calls from SIP trunk to 3300 extension. Please check whether the current IOS is capable?

If you require any further details, please let me know.

Thank you

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