IP Telephony and Phones

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Hello,I have an ISR 2911 with the IOS 15.3(3)M5. This gateway is configured to allow SIP Phones to register in case of a CUCM failure using the eSRST mode.Here is the configuration:voice register global mode esrst system message "Mode SRST" max-dn 20...

Thomas P by Level 1
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  • 10 replies
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Dear All,   I would like to use the new-ish CUBE multivrf feature (documented here). One of the limitations is: Multi-VRF is not supported on TDM-SIP gateway What is actually meant by this? If I wanted to run say an MGCP controlled NIM-4FXS on the sa...

j.a.m.e.s by Level 3
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  • 12 replies
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I am working with a network phone system running CUCM 10, alongside CER and some other similar systems. Inside the phone network, calls to 911 are failing. The caller gets a rapid busy signal when they try. I can see the attempts in the CER call hist...

pbrackett1 by Level 1
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  • 33 replies
  • 0 Helpful votes