Voice Call Using Hairpinning

[a.yoshihara]

Hello,

We want to use 'voice call using hairpinning'.

When network connectivity fails, we want to reroute the call through PSTN.

We found that when the router's Giga interface is down, the call can be rerouted by POTS dial-peer.

But when network connectivity fails without router's interface down, the call can not be rerouted.

We use Cisco2911 and 15.0(1)M6.

Can we reroute the call to PSTN, when network connectivity fails and the router's Giga interface is UP ?

Best Regards,

Aya Yoshihara

[orotter · Accepted solution]

Decrease the timeout timer for H323 Something like :

voice class h323 100

      h225 timeout tcp etablish 

   dial-peer voice 999 voip

    destination-pattern 555....

    voice-class h323 100 

For SIP under SIP-UA there are the timers :

 connect—Time to wait for a 200 response to an ACK. Default is 500 ms.
 disconnect—Time to wait for a 200 response to a BYE. Default is 500 ms.
 expires—Valid time for an INVITE. Default is 180,000 ms.
 register—Time that UA waits before sending REGISTER message. Default is 500 ms.
 trying—Time to wait for a 100 response to an INVITE. Default is 500 ms.



 

[a.yoshihara]

Thank you very very much.

Calls can be rerouted!

Best Regard,

Aya Yoshihara

[orotter]

Be careful though that you won't end up (because of PBX misconfiguration) to endless loop til something get's stack.

Check if max-con command is good solution for this scenario.

Be gentle with this command ....

You can do hunt stop for dialed number which has a prefix (which i assume you use) but it's complicated.

If you have time to investigate and play, that's a good practice.

Take care and good luck.

[a.yoshihara]

Thank you very much.

We installed successfully last week.

Best Regards,

Aya Yoshihara