Call pickup on SIP

[alan24]

I have a couple of sites on CM 5.2.1 and when a SIP calls comes in and a user tries to answer using call pickup, 60% of the time the call is dropped.
I know this is fixed in CM 6 with the introduction of "Always Use re-INVITE for Display Updates" in the protocol variations on the trunk group.
Unfortunately upgrading is not an option.
Somebody mentioned there maybe a way round this using a manipulation script on the SBC, has anybody tried this?
Any other ideas?

Many thanks Alan

 

[alan24]

Does anybody have an example of a manipulation script?

 

[Wanebo]

You can search the Avaya support website for SigMa scripts to see what you can find there. Our attitude where I work is that signaling manipulation is about the very last option we will use to pretty much one off a solution.

Why don't you upgrade to 6?

 

[alan24]

The customer has been given a price to upgrade to CM6 but is also considering replacing the affected media gateways with IPO.
They already have a couple of IPO's and they work well but I would like to solve this problem so the manipulation script maybe my last option.
Thanks for the reply and I will take a look on the support website.