My company (a SIP equipment manufacturer) has noticed a sudden flurry of problems related to RTP streams containing some packets with the wrong number of samples (different from what was negotiated). Our equipment negotiates 20ms packets, we're seeing the emission of a few 5ms packets with MARK bit set, before the 20ms packets start flowing. I theorized that some vendor's SBC or Media Gateway has released software that causes this.
It has erupted at multiple customers. I thought there was no commonality of carrier or trunk provider, but today I heard a report that T-Mobile is definitely implicated and reproducible. Other sources are possible too. Has anyone else noticed this? Does anyone have a good contact for SIP-related matters at T-Mobile?
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