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While configuring SRST and testing different scenarios, I came across an issue where I couldn’t make conference calls. Specific task asked to allow a maximum of 2 conference calls during SRST. Here is what my configuration looked like:

call-manager-fallback
secondary-dialtone 9
max-conferences 2 gain -6
transfer-system full-consult
timeouts interdigit 3
timeouts busy 3
ip source-address 10.200.200.2 port 2000
max-ephones 5
max-dn 10
system message primary Your current options
dialplan-pattern 1 3234443… extension-length 4
transfer-pattern .T
transfer-pattern .T

By having max-conferences 2 gain -6, I thought I had fulfilled the required task, but I was unable to make a 3-way conference call. After a little troubleshooting, it seems I missed something in my configuration. Can you see it? Just as in CME, you can’t do conferencing on a single line phone. Conferencing (as well as transferring) uses the second channel on a dual line phone. To accomplish this in SRST, simply make sure you have this in your configuration:

max-dn 10 dual-line

Something so simple, yet, easily overlooked.

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