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New Member

Active Calls while going into SRST

Question: If I am on a call (out through the PSTN) and the WAN link fails, will the call be cut off??

3 REPLIES

Re: Active Calls while going into SRST

It depends on the gateway protocol in use. If it is an H.323 gateway, the call will be dropped. If you're using MGCP, the call will be preserved. Please see the Call Preservation section of the following link for confirmation.

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803edaba.html#wp1020706

Hope this helps. If so, please rate the post.

Thanks,

Brandon

New Member

Re: Active Calls while going into SRST

If you have a call stream going from your IP phone to your local gateway, and the connection to the call manager fails due to a loss of a WAN link, the call becomes orphaned. You may loose certain features like the ability to put a call on hold. However, your call continues and the phone will not reregister with the router until after the call is finished.

Once the phone reregisters with the router (in srst mode) you will gain back many of the lost features.

Blue

Re: Active Calls while going into SRST

Prior to 12.3(7)T1 MGCP was the only protocol that supported "call preservation". H.323 gateways would have calls drop after a random time frame (somewhere around 2 - 5 minutes). MGPC did NOT however support call preservation for PRI's:

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administra

tion_guide_chapter09186a00803edaba.html#wp1020706

Starting with 12.3(7)T1 the h.323 command "no h225 timeout keepalive"

h.323 gateways now support call preservation:

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps5207/products_

administration_guide_chapter09186a00802a0210.html#wp1029314

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